Physics 222 Exam 1 (H/A/Practice Test Questions)

Which of the following statements are true about the electric potential or the electric potential difference? (a) The SI unit of the electric potential is volts (V). (b) The electric potential can also be expressed in units of Joules. (c) The electric potential produced by a charge at a given location provides a measure of the rate at which charge flows past that point. (d) As a positive charge moves in the direction of an electric field, it gains electric potential. (f) The electric potential difference between two points is the difference in potential energy possessed by another charge at those two points, divided by this charge.

(a) and (f) only

Which of the following are true of static charges on everyday objects? (a) Like charges repel. (b) Like charges attract. (c) Opposite charges repel. (d) Opposite charges attract. (e) A positively charged object has lost electrons. (f) A positively charged object has gained protons. (g) A negatively charged object has lost protons. (h) A negatively charged object has gained electrons.

(a), (d), (e), (h) only

Let E = 4 N/C in the x direction and B = 4 T in the -z direction. An electron is moving in the y-direction with speed 1m/s. What is the magnitude of the acceleration of the electron in m/s2?

0

A wire carries a steady current of 0.9 A. A straight section of the wire is 1.07 m long and lies along the y-axis within a uniform field B = 1.89 T in the z-direction. What is magnitude of the magnetic force on the section of wire in N. Enter a number with two digits behind the decimal point.

1.82

Analyze the circuit shown below to find the total power supplied by the battery in mW.

10.3

A current of 2.1 A flows through the heating element of heater converting 440 J of electrical energy into thermal energy every second. What is the voltage (in V) across the ends of the heating element? Enter a number with one digit behind the decimal point.

209.5

Which graph can represent the gravitational vector field near the surface of Earth? 1. A 2. B 3. C 4. D

3. C (lines of the same magnitude all facing down)

The potential difference between the two plates of a capacitor is 19 V. If the separation between the plates is 2.3 mm, what is the strength of the electric field between the plates N/C? Enter an integer.

8261

Two positive point charges, each with charge q, separated by a distance d, repel each other with a force of magnitude 20 N. What is the magnitude of the force between two positive point charges of magnitude 11.58 q, separated by a distance 5.5 d in units of N? Enter a number with two digits behind the decimal point.

88.66

What do you know about atoms, elementary particles, and charges? Select multiple correct answers! A. Neutral objects become negatively charged by acquiring additional electrons from other objects. B. Protons and electrons have charges qe and -qe , respectively, where qe is the smallest quantum of charge. C. Protons and neutrons and electrons are all charged particles making up atoms. D. Electrically neutral materials contain the same number of protons and electrons. E. Neutral objects become positively charged by acquiring additional protons from other objects.

A,B,D

Which one of the following best illustrates magnetic field lines associated with the bar magnets shown? A. (d) B. (c) C. (b) D. (a) E. None of these, since the field lines encircle the bar magnet according to the right hand rule.

D. (a)

In the circuit shown, two capacitors and a resistor in series are connected to a battery. Initially the switch is open. What is the current through the resistor a long time after the switch has been closed? A. 5*10-5 A B. 1 A C. 1.25*10-5 A D. 0 A E. 4 A

D. 0 A

In a series RC circuit a charged capacitor with capacitance C is being discharged though a resistor of resistance R. Plots of voltage and current versus time are shown below. What is the resistance of this series RC circuit? A. 4 Ω B. 100 Ω C. 2000 Ω D. 10000 Ω E. 1 Ω

D. 10000 Ω

Two neutral conducting metal spheres on insulating stands are in contact with each other. A positively charged rod is brought near to sphere A. Which of the following statements must be true about the spheres when the charged rod is in the position shown? A. Both spheres remain neutral. B. Sphere A is positive and sphere B is negative. C. Both spheres are negative. D. Sphere B is positive and sphere A is negative.

D. Sphere B is positive and sphere A is negative.

In the early universe and in stars, deuterium nuclei are produced from the combination of one proton and one neutron, with the release of a gamma ray. What is the charge on a deuterium nucleus in units of qe = 1.6*10-19 C? A. -1 B. 0 C. 2 D. -2 E. 1

E. 1

Determine the equivalent resistance between points A and B in the following circuit. A. 13.5 kΩ B. 23.7 kΩ C. 1.21 kΩ D. 34 kΩ E. 15 kΩ

E. 15 kΩ

What is the time constant for the discharge of this capacitor? A. 1 s B. The capacitor does not discharge because the resistors cancel each other. C. 2 s D. 5 s E. 4 s

E. 4 s

Consider the 5 arrangements of charges below. (Electric Field Hockey Simulation) Which of the following statements is true? 1) All of the pucks feel a force to the right. 2) The puck in C feels a greater force to the right than the puck in D. 3) The puck in E feels a force to the right that is four times greater than that felt by the puck in B. 4) The net force on the puck in A is zero. 5) The puck in E feels a force to the right that is four times greater than that felt by the puck in D.

1 and 3 only

Which of the points shown in the figure below are at the same potential?

1 and 4.

Which graph can represent the gravitational vector field at large distances from the surface of Earth? 1. A 2. B 3. C 4. D

1. A (Lines of different magnitudes all pointing TOWARDS the center)

Earth and Moon attract each other via the gravitational force. Which force diagram correctly represents the magnitude and direction of the force on each of these objects? 1. A 2. B 3. C 4. D

2. B (equal and opposite forces)

When a positive charge is released from rest in a uniform electric field, it will 1. remain at rest. 2. move with constant acceleration. 3. move with constant velocity. 4. move with linearly increasing acceleration. 5. You cannot tell from the information given.

2. move with constant acceleration.

A cosmic ray electron (m = 9.1*10-31 kg) moves at 7.98*106 m/s perpendicular to the Earth's magnetic field at an altitude where field strength is 0.85*10-5 T. What is the radius r (in m) of the circular path the electron follows? Enter anumber with two digits behind the decimal point.

5.33

How much energy (in milliJ) is stored in a 34 microFarad capacitor if the voltage across the capacitor is 56 V? Enter a number with two digits behind the decimal point.

53.31

An electron (|q| = 1.6*10-19 C, m = 9.1*10-31 kg) is suspended at rest in a uniform electric field of magnitude E. Its weight mg (g = 9.8 m/s2) near the Earth's surface is exactly canceled by the electrostatic force. Determine the magnitude of the electric field E in units of pN/C. (1 pN = 10-12 N)

55.7

The normal of a one-turn circular loop of radius r = 2.4 cm makes an angle of 72 degrees with the direction of a uniform magnetic field of magnitude 1 T. What is the magnitude of the torque (in milliNewton m) exerted on the loop by the field when a current I = 4.3 A circulates in the loop? Enter a number with two digits behind the decimal point.

7.4

A high voltage transmission line has an aluminum cable of diameter 3.4 cm and is 242 km long. The resistivity of Aluminum is 2.8*10-8 Ωm. What is the resistance of this cable in Ω? Enter a number with one digit behind the decimal point.

7.5

A cube with sides of area 3 cm2 contains a 44 nanoCoulomb charge.Find the flux of the electric field through the surface of the cube in unis of Nm2/C. Enter a number with one digit behind the decimal point.

= nC*10^-9/(8.85*10^-12) =4971.8

Two capacitors have an equivalent capacitance of 8 pF if connected in parallel, and 2 pF, if connected in series. Find C1 and C2. A. C1 = 4 pF, C2 = 4 pF B. C1 = 3 pF, C2 = 5 pF C. C1 = 8 pF, C2 = 2 pF D. This cannot be determined from the information given. E. C1 = 8 pF, C2 = 1 pF

A. C1 = 4 pF, C2 = 4 pF

Equipotential lines are shown. For which region is the magnitude of the electric field the greatest? A. D B. It is the same everywhere. C. A D. B E. C

A. D

Which of the following statements about a conductor in electrostatic equilibrium is false? (a) The electric field inside the conductor is zero. (b) Just outside the conductor, the electrostatic field is perpendicular to its surface. (c) The net charge inside the conductor is zero, all excess charge resides on the surface. (d) A charge located within a hole in a conductor at equilibrium feels no force from charges outside the conductor.

All the above statements are true.

What do you know about the electrostatic force that can exist between two interacting objects? Pick the correct statements from the choices below. A. It requires physical contact between the interacting objects. B. It depends on the net charge of each of the interacting objects. C. It varies inversely as 1/r 2 , where r is the distance between the interacting objects. D. It can be attractive. E. It can be repulsive.

B,C,D,E

Select two true statements about the electric field. A. A single, isolated charge does not produce an electric field. B. The direction of the electric field at a point in space is the same as the direction of the electrostatic force on a positive charge at that location. C. The direction of the electric field at a point in space is the same as the direction of the electrostatic force on a negative charge at that location. D. The electric force F can be calculated using F = qE, where E is the electric field and q is the charge placed in the field

B,D

Point P is at a perpendicular distance x from each wire carry current I in the directions indicated. What is the magnetic field B at point P? A. μ0I/(2πx) out of the page B. 0 C. μ0I/(2πx) into the page D. μ0I/(πx) into the page E. μ0I/(2πx) out of the page

B. 0

Two small objects each with a net charge of Q exert a force of magnitude F on each other. We replace one of these with a charge 4Q. What is the magnitude of the force after the replacement? A. 16 F B. 4F C. F D. F/4

B. 4F

To maintain a negative charge on sphere A and a positive charge on sphere B once the rod is removed, what must be done? A. The charged rod is removed, then the spheres are separated. B. The spheres are separated and then the charged rod is removed. C. The spheres are grounded and then the charged rod is removed. D. There is no way physical way to accomplish this.

B. The spheres are separated and then the charged rod is removed.

What is the direction of the Coulomb force on the charge pointed at by the arrow? (Charge is given in arbitrary units.) A. There is no direction, the net force is zero. B. Towards the left C. Towards the right D. Up E. Down

C. Towards the right

A real, not ideal, battery is connected as shown. Rank the potential difference across the terminals from the greatest to the smallest. A. V1 = V2 = V3 = V4 B. V1 = V4 > V2 = V3 C. V4 > V3 > V2 > V1 D. This cannot be determined from the information given. E. V1 > V2 > V3 > V4

C. V4 > V3 > V2 > V1

The flux of water through this 3D spherical volume is A. Positive, B. Negative, C. Zero, D. Undefined.

C. Zero,

Four arrangements of charge are shown. Each charge has the same magnitude, but some are positive (+) and some are negative (-). All distances are to the same scale. In which arrangement would the magnitude of the force felt by a positive test charge placed at P be the largest? A. A only B. B only C. C only D. A and C E. B and D

E. B and D (opposite charges on either side of P)

Choose the force vector that correctly shows the direction of the net force on charge B due to the other two charges. Charge is given in arbitrary units. A. (a) B. (b) C. (c) D. (d) E. none of these, the net force is zero F. none of these, the vector should point up and left.

F. none of these, the vector should point up and left.

Find the magnitude of the electric field produced by a point charge q = 2.47 nanoCoulomb a distance r = 2.6 meters from the charge in units of N/C. Enter a number with two digits behind the decimal point. Use k = 9*109 (Nm2)/C2.

F= (8.99*10^9)* (q)* 10^-9/r^2 F= 3.29

Suppose that a picture of electric field lines is drawn following the convention that 4 field lines emerge from a small sphere with 4 pC of charge. In this picture there is an irregular closed surface, the interior of which is hidden, as shown below. The net amount of charge inside the closed surface must be A. +0 pC B. -4 pC C. +6 pC D. +8 pC E. +2 pC F. -8 pC G. +4 pC H. -2 pC

G. +4 pC

Two uniformly charged spheres are firmly fastened to and electrically insulated from frictionless pucks on an air table. The charge on sphere 2 is three times the charge on sphere 1. Which force diagram correctly shows the magnitude and direction of the electrostatic forces? A. 4 B. 3 C. 2 D. 1 E. 7 F. 6 G. 5

G.5

A capacitor with a charge of 4.5 C has its terminals shorted by a metal wire so that the charge flows off within 2.1 s. What is the average current flowing during that time in Ampere (A)? Enter a number with two digits behind the decimal point.

2.14

Two 2.8 microCoulomb charges are 3.4 m apart. How much energy (in milliJoule) went into assembling these two charges? Enter a number with one digit behind the decimal point.

20.8

Two 3.7 microCoulomb charges are 1.1 m apart. What is the potential at each charge due to the other in V? Enter an integer.

30273

A wire carries a steady current of 18.9 A. What total charge (in C) passes through a cross-sectional area of the wire in a 17 s time interval? Enter a number with one digit behind the decimal point.

321.3

Find the current I (in A) in a long straight wire that would produce a magnetic of 2.1*10-4 T at a distance of 3.3 cm from the wire. Enter a positive number with one digit behind the decimal point.

34.7

254 J of work are required to carry a 52 C charge from point 1 to point 2. What is the magnitude if the potential difference between point 1 and point 2 in units of V? Enter a number with one digit behind the decimal point.

4.9

A 32 microCoulomb charge is located at the origin and a -22 microCoulomb charge is located on the y-axis at y = 39.1 cm. What is the magnitude of the force with which the charges attract each other in units of N? Enter a number with two digits behind the decimal point.

41.44

A solid, conducting sphere of radius R is positively charged. Of the following distances from the center of the sphere, which location will have the greatest electric potential? (Take V = 0 at r = infinity.) A. r = 0 (center of the sphere) B. r = 1.1 R. C. The potential is constant, there is no maximum value. D. r = 1.25 R. E. r = 2 R.

A. r = 0 (center of the sphere)

A certain physics textbook shows a region of space in which two electric field lines cross each other. We should conclude that A. the author of the textbook made a mistake. B. at least two point charges are present. C. an electrical conductor is present. D. an insulator is present. E. the field points in two directions at the same place.

A. the author of the textbook made a mistake.

A solenoid is connected to a battery as shown. A bar magnet is placed nearby. What is the direction of the magnetic force the solenoid exerts on the bar magnet? A. to the left B. There is no magnetic force, only an electric force. C. upward D. to the right E. downward

A. to the left

Assume that the potential V is higher at point A than at point B. Which statement then is correct? A. A negative charge gains electrostatic potential energy when it moves from point B to point A. B. Any charge can move along an equipotential line from point A to point B and neither gain or lose electrostatic potential energy. C. A positive charge gains electrostatic potential energy when it moves from point B to point A. D. An externall force has to do positive work to move a positive charge from point A to point B.

C. A positive charge gains electrostatic potential energy when it moves from point B to point A.

Three pairs of conducting plates (capacitors) are shown in the figure below. Pair B has the same separation as pair A but twice the plate area. Pair C has the same area as pair A but half the separation between the plates. The insulating material between the plates of all capacitors is the same. Rank the pairs of plates according to their capacitance. A. C > A > B B. C > A = B C. C = B > A D. B > A > C E. A = B = C

C. C = B > A

You double the voltage across a certain conductor and you observe the current increases three times. Does the conductor obey Ohm's law? A. Ohm's law states that the resistance increases with temperature. So not enough information is given to decide if the conductor obeys Ohm's law. B. The conductor obeys Ohm's law since the current increases when V increases. C. The conductor does not obey Ohm's law.

C. The conductor does not obey Ohm's law.

A mass spectrometer is to be used to separate protons from deuterium nuclei. A deuterium nucleus has the same charge and twice the mass as a proton, since it contains an extra neutron. Both the deuterium and the proton nuclei are accelerated by the same voltage. Which of the following statements is true? A. Both the proton and the deuterium will move along the same circular path. B. Mass spectrometers cannot be used to analyze nuclei, only molecular ions. C. The deuterium will have a larger radius of curvature, since it is more massive. D. The deuterium will not be deflected in the mass spectrometer, since it contains a neutron. E. The deuterium will have a smaller radius of curvature, since it is more massive.

C. The deuterium will have a larger radius of curvature, since it is more massive.

A bird sits on a high-voltage line. Why does the bird not get hurt? A. The bird is very small, and therefore can hold only a small amount of charge. B. Birds are not affected by electric fields. C. The whole bird is at approximately the same potential, so there is no electric field across it. D. The bird is very lucky. E. The bird's charge is opposite to that of the line, and the charges cancel out.

C. The whole bird is at approximately the same potential, so there is no electric field across it.

A charged insulator and an uncharged metal A. always repel one another. B. exert no electrostatic force on one another. C. always attract one another. D. may attract or repel, depending on the sign of the charge on the insulator.

C. always attract one another.

A proton is initially at rest at x = d and an electron is initially at rest at x = -d. At the same instant they are released. They subsequently A. collide at x = 0. B. orbit each other. C. collide close to x = d. D. collide close to x = -d. E. fly away from each other.

C. collide close to x = d

Compared to the effective resistance of two resistors connected in series, the effective resistance of the same two resistors connected in parallel is A. the same. B. either higher, lower, or the same, depending on the resistances of the individual resistors C. lower. D. higher.

C. lower.

In a series RC circuit a charged capacitor with capacitance C is being discharged though a resistor of resistance R. Plots of voltage and current versus time are shown below. Find the time constant τ of the circuit. A. τ = 0 B. τ = 4 s C. τ = 1 s D. τ = 0.5 s E. τ = 2 s

C. τ = 1 s

A 9 V battery is rated at 80 Ah. It can deliver a current of 80 A for one hour, or a current of 40 A for 2 hours, etc. What is the total energy stored in the battery? A. 720 kWh B. 0.66 kWh C. 0.2 kWh D. 2.6 MJ E. 0.72 J

D. 2.6 MJ

A negatively charged balloon is attracted to a neutral wooden cabinet due to polarization. Which one of the following diagrams best depict why this occurs? A. A B. F C. E D. D E. B F. C

D. D

Which of the charge configurations depicted would give rise to the potential shown below? A. D B. A C. C D. E E. B

D. E

A bulb (i.e., a resistor) is connected in series to a switch, a battery, and an uncharged capacitor. At t = 0, the switch is closed. Which of the following best describes the brightness of the bulb as a function of time? A. (c) B. The current is constant since the battery voltage is constant. C. (b) D. (d) E. (a)

A. (c)

The resistivity of aluminum is 58% higher than that of copper. A copper high voltage line has diameter 1 cm. If is replaced by an aluminum line of the same resistance and length, the aluminum line has diameter A. 1.26 cm. B. 0.64 cm. C. 1.58 cm. D. 0.8 cm.

A. 1.26 cm.

A series series RC circuit has a resistance of 106 Ω and a time constant of 10-5 s. What is the capacitance of this circuit? A. 10 picoFarad B. 100 microFarad C. 2 microFarad D. 1 Farad E. 0.01 Farad

A. 10 picoFarad

A superconducting solenoid (coil) is used to generate a magnetic field of 10 T. If the solenoid winding has 2000 turns/m, what is the required current in the solenoid? A. 3979 A B. 25m A C. 2000 A D. 398 A E. 4 mA

A. 3979 A

A memory cell in a computer contains a capacitor to store charge. Charge being stored or not being stored corresponds to the binary digits 1 and 0. To pack the cells more densely, trench capacitors are often used in which the plates of a capacitor are mounted vertically along the walls of a trench etched into a silicon chip. If we have a capacitance of 50*10-15 F and each plate has an area of 30*10-12 m2 (micron-sized trenches), what is the plate separation? A. 5.3*10-9 m B. 1.7*10-3 m C. 1.5* 10-14 m D. 6*10-6 m

A. 5.3*10-9 m

Positive and negative charges of the same magnitude, as well as a small positive test charge are placed as shown in each of the four figures. Rank the magnitude of the force the test charge feels in each of the four figures. A. B > A > C > (D =0) B. B > (A = C) > (D = 0) C. D > A > B > C D. (C = A) > (B = D = 0 ) E. A > C > (B = D = 0 )

A. B > A > C > (D =0)

Through rubbing an object has acquired a charge of -1 nanoCoulomb. A. Electrons have been transferred to the object. B. The object must be made out of insulating material. C. The object is a semiconductor. D. The object must be made out of conducting material. E. 6.25*10-9 protons have been rubbed off the object.

A. Electrons have been transferred to the object.

A current in a long, straight wire produces a magnetic field. The magnetic field lines A. form circles that go around the wire. B. come in from infinity to the wire. C. form circles that pass through the wire. D. are parallel to the wire. E. go out from the wire to infinity.

A. form circles that go around the wire.

When a positive charge is released from rest in a uniform electric field, it will A. move with constant acceleration. B. remain at rest. C. move with constant velocity. D. move with linearly increasing acceleration.

A. move with constant acceleration.

In the figure below, the cube is 40 cm on each edge. Four straight-line segments, ab, bc, cd, and da form a closed loop that carries a current I = 5 A. A uniform magnetic field B = 0.02 T is in the positive y-direction. What is the magnitude of the magnetic force on the wire segment da? A. 0.04 N B. 0.057 N C. 0.6 N D. 0.914 N E. zero

B. 0.057 N

A current loop lies in the xy-plane. It has a magnetic dipole moment of 0.1 A-m2 along the z-axis. A uniform 2 T magnetic field parallel to the xz-plane makes a 30° angle with the x-axis. What is the magnitude of the net torque on the current loop? A. 0.1 Nm B. 0.17 Nm C. 0 Nm D. 0.87 Nm E> 0.2 Nm

B. 0.17 Nm

Which compass shows the correct direction of the magnet field at point A? A. 5 B. 1 C. 4 D. 3 E. 2

B. 1

Three pithballs are suspended from thin threads. Various objects are then rubbed against other objects (nylon against silk, glass against polyester, etc.) and each of the pithballs is charged by touching them with one of these objects. In one set of experiments, it is found that pithballs 1 and 2 repel each other and that pithballs 2 and 3 attract each other. From this we can conclude that A. all charges are negative. B. 1 and 3 carry charges of opposite sign. C. all charges are positive. D. 1 and 2 carry charges of opposite sign. E. 1 and 3 carry charges of equal sign and opposite the sign of 2.

B. 1 and 3 carry charges of opposite sign.

The figure below shows different ways to connect a light bulb to a battery with wires. Which of the bulbs will light up? A. 4 B. 5 C. 1 D. 3 E. 2

B. 5

The SI unit of capacitance is Farad (F). This is the same as A. V/C. B. C/V. C. J/C. D. C/J. E. J2/C.

B. C/V.

A parallel combination of resistors has an equivalent (or effective) resistance of 2 Ω. Which one of the following is true? A. The sum of the reciprocals of the individual resistances is 2 Ω. B. Each of the individual resistances is greater than 2 Ω. C. The sum of the individual resistances is 2 Ω. D. Each of the individual resistances is smaller than 2 Ω.

B. Each of the individual resistances is greater than 2 Ω.

Two very flat, metallic plates separated a distance d have a potential difference of 600 Volts between them as shown below. A proton and positron (which is a positively charged electron) are released from rest at the surface of the metal plate held at 600 Volts. Which of the following statement(s) is (are) correct?I. The positron's acceleration is larger than the proton's acceleration.II. The positron's acceleration is the same as the proton's acceleration.III. The positron's acceleration is smaller than the proton's acceleration.IV. The positron's kinetic energy will be larger than the proton's kinetic energy right before the particles hit the 0 Volt plate.V. The positron's kinetic energy will be the same as the proton's kinetic energy right before the particles hit the 0 Volt plate.VI. The positron's kinetic energy will be smaller than the proton's kinetic energy right before the particles hit the 0 Volt plate. A. II and V only. B. I and V only. C. I and IV only. D. II and VI only. E. III and VI only.

B. I and V only.

Which is correct language usage? A. Voltage in a resistor, current through a resistor B. Voltage across a resistor, current through a resistor C. Voltage against a resistor, current across a resistor D. It's just semantics; it doesn't matter. E. Voltage through a resistor, current in a resistor

B. Voltage across a resistor, current through a resistor

You wish to double the power dissipated by a heating device. You could A. double the current while keeping the resistance the same. B. double the resistance while keeping the current the same. C. double both the potential difference and the current. D. double the resistance while keeping the potential difference the same. E. double the potential difference while keeping the resistance the same.

B. double the resistance while keeping the current the same.

If the charge on each of two identical tiny spheres is doubled while their separation is reduced by a factor of 2, their force of interaction A. will increase by a factor of 4. B. will increase by a factor of 16. C. will double. D. will increase by a factor of 8. E. will stay the same.

B. will increase by a factor of 16.

A cubical closed surface has N inward electric flux lines passing through one face and N outward electric flux lines passing through the opposite face as shown in the figure. The flux lines exhibit convergence and there are no flux lines passing through any other face. If the magnitude of the electric field at the centre of the cube is E, the total charge inside the cube is A. ε0N. B. zero. C. 2ε0N. D. -2ε0N. E. -ε0N.

B. zero.

The figure below shows the equipotential surfaces of an electric dipole in the xy-plane. The x and y scales are in units of meter. The charge on the left is positive. Each color change represents a a change in the potential of 5 V. Estimate the magnitude and direction of the electric field in units of V/m = N/C at x = 5.5 m, y = 13 m. A. ~ 1 V/m to the left B. ~11 V/m to the left C. ~ 10 V/m to the right D. ~ 0.5 V/m to the right E. ~100 V/m to the left

B. ~11 V/m to the left

A positive charge is placed at one of 3 locations in a region where the electric field is uniform. Compare the magnitude F of the electric force on the charge at the different locations. A. F is greatest at location 2. B. F is greatest at location 3. C. F is zero at all locations. D. F is the same at all locations, but not zero. E. F is greatest at location 1.

D. F is the same at all locations, but not zero.

Two light bulbs, one rated at 50 W and a second rated at 100 W, are both supposed to be connected to a 110 V source of emf. Which one of the following is true? A. The 50 W bulb has four times the resistance as the 100 W bulb. B. The 50 W bulb has one quarter the resistance as the 100 W bulb. C. The 50 W bulb has half the resistance as the 100 W bulb. D. The 50 W bulb has twice the resistance as the 100 W bulb. E. Both bulbs have the same resistance, since they are connected to the same 110 V emf.

D. The 50 W bulb has twice the resistance as the 100 W bulb.

5 microCoulomb of excess negative charge is placed on a previously neutral conductor. What happens to this charge if the conductor is left undisturbed? A. The excess charge moves to the center of the conductor, as far away from the surface as possible. B. The excess charge distributes itself evenly throughout the conductor. C. The excess charge distributes itself over the surface of the conductor so that the electric field in the interior is maximized. D. The excess charge distributes itself over the surface of the conductor so that the interior is free of electric fields.

D. The excess charge distributes itself over the surface of the conductor so that the interior is free of electric fields.

A stationary positive charge +Q is located in a magnetic field B, which is directed toward the right as indicated. The direction of the magnetic force on Q is A. up. B. towards the right. C. towards the left. D. The magnetic force will be zero. E. down.

D. The magnetic force will be zero.

The magnetic domains in a non-magnetized piece of iron are characterized by which orientation? A. Adjacent domains are aligned anti-parallel to each other. B. Adjacent domains are aligned at 45o with respect to each other. C. Adjacent domains are oriented perpendicular to each other. D. They are oriented randomly. E. They are all aligned parallel to each other.

D. They are oriented randomly.

An electron travels through free space from point A, which is at 100 V, to point B, which is at 200 V. The kinetic energy of the electron during this trip A. increases by 100 V. B. stays constant. C. decreases by 100 V. D. increases by 1.6*10-17 J. E. decreases by 1.6*10-17 J.

D. increases by 1.6*10-17 J.

A wire carries a current I as shown below. The magnetic field at the position P points A. into the page. B. down. C. up. D. out of the page. E. right. F. left.

D. out of the page.

A uniform magnetic field is directed into the page. A charged particle, moving in the plane of the page, follows a clockwise spiral of decreasing radius. A reasonable explanation is that A. the charge is positive and slowing down. B. the charge is negative and speeding up. C. the charge is positive and speeding up. D. the charge is negative and slowing down.

D. the charge is negative and slowing down.

Equipotential lines around two point charges are shown. What is the direction of the electric field at points A and B? A.) A: to the right B: to the right B.) A: to the left B: down C.) The electric field has no direction. D.) A: to the right B: up E.) A: to the rightB: to the left

D.) A: to the right B: up

Consider a very long solenoid with radius R and length L (R << L). The magnetic field at the center of the solenoid is B0. A second solenoid is constructed that has twice the radius, twice the length, and carries twice the current as the original solenoid, but has the same number of turns per meter. The magnetic field at the center of the second solenoid is A. B0/4. B. B0. C. 24B0. D. B0/2. E. 2B0.

E. 2B0.

The immediate cause of many deaths is ventricular fibrillation, an uncoordinated quivering of the heart as opposed to proper beating. An electric current discharged to the chest can cause momentary paralysis of the heart muscle, after which the heart will sometimes start organized beating again. A defibrillator is a device that applies a strong electric shock to the chest over a time interval of a few milliseconds. Assume that an energy of 300 J is to be delivered from the defibrillator, having a 30.0 microFarad capacitance. To what potential difference must the defibrillator be charged? A. 20 V B. 200000 V C. 10000 V D. 316 V E. 4472 V

E. 4472 V

The figure below shows the electric field lines for a system of two point charges. Point charge q2 has a charge of 2 microCoulomb. What is the charge of point charge q1? A. 4 microCoulomb B. 2 microCoulomb C. -8 microCoulomb D. -2 microCoulomb E. 8 microCoulomb F. This cannot be determined. G. -4 microCoulomb

E. 8 microCoulomb

Two balls rest on a frictionless surface. One ball is given a charge of +Q. The other ball is given a charge of +3Q. Which diagram best represents the magnitude and direction of the force vectors on the balls? A. None B. A C. D D. B E. C

E. C

Charges Q1 and Q2 are situated as shown below. The electric field is zero at point P. What conclusions can be drawn about the charges Q1 and Q2?I. The magnitudes of Q1 and Q2 are equal.II. The magnitude of Q1 is greater than the magnitude of Q2.III. The magnitude of Q1 is less than the magnitude of Q2.IV. Q1 and Q2 have the same sign.V. Q1 and Q2 have different signs A. III and IV are correct. B. III and V are correct. C. I and IV are correct. D. II and V are correct. E. II and IV are correct.

E. II and IV are correct.

Three resistors connected in series carry currents labeled I1, I2, I3, respectively. Which of the following expresses the value of the total current IT in the system made up of the three resistors? A. IT = (1/I1 + 1/I2 + 1/I3)-1 B. IT = (1/I1 + 1/I2 + 1/I3) C. IT = 3I1 = 3I2 = 3I3 D. IT = I1 + I2 + I3 E. IT = I1 = I2 = I3

E. IT = I1 = I2 = I3

Which of the statements below are true?(1) Whenever electrons are in motion, a current flows.(2) A "D" battery is labeled as providing 1.5 volts. This voltage characterizes the amount of current that the battery supplies when it is installed in an electronic device.(3) You plug a space heater into an outlet and the temperature of the heating coils increases for some time before it becomes stable. As the temperature of the coils increases, their resistance increases, and therefore the power consumed by the space heater increases. A. (2) only B. (1) only C. (3) only D. All these statements are true. E. None of these statements are true.

E. None of these statements are true.

Which of the following statements are true? (a) The electric field of a point charge always points away from the charge.(b) All macroscopic charges Q can be written as Q = ±Ne, where N is an integer and e is the charge of the electron.(c) Electric field lines never diverge from a point in space.(d) Electric field lines never cross at a point in space. A. All statements are true. B. Only statements (a) and (c) are true? C. Only statements (b), (c), and (d) are true. D. Only statements (a) (c) and (d) are true. E. Only statements (b) and (d) are true. F. Only statement (d) is true

E. Only statements (b) and (d) are true.

The paths of several particle moving through a region with a magnetic field pointing into the page are shown. Which particles are positively charged? A. Particles 3 and 5 B. Particles 1 2 and 4 C. Particles 2 and 4 D. Particles 1 and 2 E. Particles 1 and 5

E. Particles 1 and 5

Equipotential lines around several point charges are shown. What are the signs of the charges at points A and B? A. Both charges are positive. B. The charge at A is positive and the charge at B is negative. C. Both charges are negative. D. This cannot be determined from the information on the diagram. E. The charge at B is positive and the charge at A is negative.

E. The charge at B is positive and the charge at A is negative.

Consider the situation shown below. A wire carrying a current flowing into the page is placed between the poles of a horseshoe magnet. Which statement is correct regarding the magnetic force on the wire? A. The magnetic force on the wire points towards the bottom of the page.. B. The magnetic force on the wire points towards the right. C. No magnetic force acts on the wire, since it has no net charge. D. The magnetic force on the wire points towards the top of the page. E. The magnetic force on the wire points towards the left.

E. The magnetic force on the wire points towards the left.

A proton is released near the equator and falls toward the earth under the influence of gravity. The magnetic force on the proton will be toward the A. south. B. The magnetic force will be zero. C. north. D. west. E. east.

E. east.

A positive charge is moving with velocity v in a region with magnetic field B. What is the direction of the force on the particle? A. out of the page B. There is no force on the particle. C. in the direction of v D. opposite the direction of v E. into the page

E. into the page

The figure below shows a proton (q = +e) at one instant with velocity V pointing along the positive x-axis. The proton is moving through a magnetic field B that points along the positive y-axis. At the instant shown the magnetic force on the proton A. points in the positive y-direction, B. is zero. C. points in the positive x-direction, D. points in the negative x-direction, E. points in the positive z-direction, F. points in the negative z-direction, G. points in the negative y-direction,

E. points in the positive z-direction,

What is the direction of the magnetic force on the wire segment cd? A. the z-direction B. the x-direction C. the negative x-direction D. the y-direction E. the negative z-direction

E. the negative z-direction