General Physics II Final Review

A candle C sits between two parallel mirrors, a distance 0.2d from mirror 1. Here d is the distance between the mirrors. Multiple images of the candle appear in both mirrors. How far behind mirror 1 are the nearest three images of the candle in that mirror?

0.2d, 1.8d, 2.2d

A 2-A current is flowing through the set of resistors shown in the figure below. The point "E" is where the electric potential is zero. What is the potential at point B?

10 V

Singly ionized isotopes of carbon move at the same speeds through a uniform magnetic field. They move in a circle, perpendicular to the magnetic field. They move in a circle of radius R given by (mv)/(qB). Ran the ions based on the frequency of their rotational motions

14C<13C<12C

A negatively charged particle shoots into a uniform magnetic field directed out of the paper, as shown in the figure. A possible path of this particle is

3

The figure shows three capacitors connected in series, one has double the capacitance and one triple the capacitance of the other. Rank the capacitors based on the voltage drops across their plates.

3C<2C<C

Two very long parallel wires in the xy-plane, a distance 2a apart, are parallel to the y-axis and carry equal currents I as shown in the figure. The +z direction points perpendicular to the xy plane in a right handed coordinate system. If the left current flows in the +y direction and the right current flows in the -y direction, which one of the grraphs shown in the figure below best represents the z component of the net magnetic field, in the xy-plane, as a function of x?

4

Charged particles are arranged in an equilateral triangle. The distance between each pair of charges is d.. The particles are all the same size and mass but they have different charges. Determine the amount of work done by the electric forces acting between the charges when these charges are brought from infinitely far away to the arrangement show.

4kq^2/d

The figure shows three long, parallel current-carrying wires. The magnitudes of the currents are equal and their directions are indicated in the figure. Which of the arrows drawn near the wire carrying current 1 correctly indicates the direction of the magnetic force acting on that wire?

A

The figure shows the interference pattern obtained in a double slit experiment with light of wavelength lambda. Identify the fringe or fringes that result from the interference of two waves whose paths differ by exactly 2lambda.

A and D

The figure shows an electromagnetic wave traveling in the +x direction, towards a circular conducting loop of wire. the conducting loop lies in the xy-plane. Which statement correctly describes what happens while the wave is passing the loop

A current that alternates between clockwise and counterclockwise is induced in the loop

In each figure, two charges are fixed in place on a grid, and a point near those particles is labeled P. All of the charges are the same size, Q, but they can be either positive or negative. Rank the strength of the electric force on a charge +q that is placed at P.

A<B<D<C

Six identical rectangular wire loops are moving to the right at the same constant speed. There is a uniform magnetic field coming out of the page in the region enclosed by the dashed line. The rectangular loops are all 5 cm by 10 cm. Some wire loops are completely exposed to the field, some are 1/2 inside the field or 1/4 inside the field. Some are not completely in the field, but more that 1/2 inside the field. Rank the magnetic flux passing through the rectangular loops at the moment shown.

A<E=F<C<B<D

Six permanent magnets are moving toward the circular wire loops that are fixed in place. All of the wire loops are the same radius and are made of the same wire, but some of them have gaps. The magnets are all identical, but they are approaching the loops are different speeds and with different orientations. Rank how strongly the loops are repelled by the approaching magnet when the magnets are 3 cm from the loops

B=E<D<A=F<c

The image shows two sources of waves. Wavelengths produced by the two sources are identical. the wavefronts shown overlap, producing an interference pattern. The bold semi-circles represent wave crests and the other semi circles represent wave troughs. Select the labeled points where destructive interference occurs

F, H, J, L, N, P

Two massless bags contain identical bricks, each brick having a mass M. Initially, each bag contains four bricks, and the bags mutually exert a gravitational attraction F1 on each other. You now take two bricks from one bag and add them to the other bag, causing the bags to attract each other with a force F2. What is the closest expression for F2 in terms of F1.

F2=(3/4)F1

Electrically charged particles of equal mass are moving though regions of space in which there may be magnetic fields pointing out of or into the page. In each case, shown is the sign of the charge and a portion of the path the charge follows through the region. All of the charges enter this region with the same initial velocity. Rank the magnitude of the magnetic field in the region.

F<C=D<A<B=E

Shown below are eight combination of capacitors. The batteries produce a voltage difference across each combination, that results in each capacitor being fully charged. In each combination, one capacitor is labeled X. Rank these circuits in terms of the voltage across capacitor X.

F=H<A=B<C=D=E=G

In both cases, an object is placed 20 cm from a converging lens. The image position in Case A is to the left of the lens (and also to the left of the object), while in Case B the image position is to the right of the lens. Is the focal distance the lens i. greater in case A ii. greater in case B, or iii. the same in both cases

Greater in case A

The two resistors R1 and R2 (R2>R1) are connected in series as shown Identify the true statements.

I1=I2=I3, The electrical power consumption is greater in R2 than in R1, The potential at point c is lower than at point b

Two very large, parallel insulating sheets have the charge densities shown. Rank the spaces (I) Left of sheet, (II) Between sheets A and B and (III) Right of sheet B, based on the magnitude of the electric field in those regions

I=III<II

You are given the following information about five lenses and images they are forming of objects 1.0cm tall. I. the object is 16 cm from a lens the image formed is 8 cm from the lens, the object and image are on opposite sides of the lens. ii. the object is 16 cm from a lens, the image formed is 7 cm from the lens, the image is on the same side of the lens as the object. iii. the object is 7 cm form a lens, the image formed is 7 cm from the lens, the object and image are on opposite sides of the lens. iv. the object is 7 cm from a lens, the image formed is 16 cm from the lens, the image is on the same side of the lens as the object. v. the object is 7 cm from a lens, the image formed is 16 cm from the lens, the object and image are on opposite sides of the lens

IV

The battery in the circuit shown in the figure has no internal resistance. After you close the switch S, will the brightness of bulb B1 increase, decrease, or stay the same?

Increase

Consider the circuit with a battery, 3 bulbs, and one initially open switch. The internal resistance of the battery is so low compared to the bulb's resistance that we can treat the battery as having zero internal resistance. What happens to the current through the battery when you close the switch?

It increases

The image shows the magnetic field lines created by a current traveling in a circular loop. All lines are curved with the exception of the one that passes through the center of the loop. This one straight line is called the axis of the loop. The plane of the loop is perpendicular to this line. Imagine moving along the axis of the current-carrying loop in the figure, starting at a point well to the left of the loop and ending at a point well to the right of the loop. How would the magnetic field strength vary as you moved along this path?

It would increase as you approach the loop, and then decrease as you move away from the loop.

The capacitor in the figure is initially uncharged. The switch S is closed at t=0. Long after the switch is closed is there a current through the battery? In other words, is there a final steady current through the battery, or is it equal to zero?

It's not zero

A light bulb glows because it has resistance. The brightness increases with the electrical power dissipated in the bulb. In the circuit show in the figure on the left, the two bulbs are identical. compared to bulb A, does bulb B glow more brightly, just as brightly, or less brightly?

Just as brightly

A light bulb glows because it has resistance. The brightness increases with the electrical power dissipated in the bulb. In the circuit shown in the figure on the left, the two bulbs are identical. Bulb B is removed from the circuit on the left, and then the circuit is closed, as show in the figure on the right. Compared to the brightness of bulb A in figure a, does bulb A in b now glow more brightly, just as brightly, or less brightly?

More brightly

A small light bulb is placed near a plane mirror. The locations of five observers are marked, labeled A-E as shown. Three students are discussing which observers will see an image of the bulb. Student A: the image of the bulb will be formed the same distance behind the mirror as the bulb is in front. All of the observers can see the mirror, so they will be able to see the image. Student B: the images formed by a plane mirror are virtual images - none of the observers will be able to see them because they aren't real. Student C: there will be an image of the bulb, because rays from the mirror and bounce off. But only observer c will see the image, because only observer c is in front of the mirror. with which student, if any, do you agree

None

Consider the network of resistors shown below. Are any two or more in series? Are any two or more in parallel? (Do not consider equivalent resistances)

None are in parallel. R2 and R5 are in series.

The image shows an object image and mirror. Apply the sign convention to select the correct statement

Object distance is positive, image distance is negative, radius of curvature is positive

An electron moves in the +direction as shown in the figure. What is the direction of the magnetic field at point A created by the electron?

Out of the page

Two capacitors, C1 and C2, are connected in series across a source of potential difference. With the potential source still connected, a dielectric is now inserted between the plates of capacitor C1. What happens to the charge on capacitor C2?

The charge on C2 increases

A wire loop with resistance R is placed outside of and concentric with a long, tightly wound solenoid (coil) as shown. The solenoid has an initial current I. The magnetic field produced by the solenoid is proportional to the current it carries. The current decreases to half its initial value in a time interval. This change will produce an induced current in the wire loop. Which of the following changes would decrease the current induced in the wire loop?

The decrease in the solenoid current occurs in longer time and the diameter of the wire loop is doubled

Four point charges are fixed in position, located at the corners of a square. Point P is at the center. Two charges are positive and two are negative, but all charges have the same magnitude. Which statement is true?

The electric potential at P is zero, but the electric field is not.

A positively charged particle is placed along the positive x axis and a particle carrying a negative charge of equal magnitude is placed at equal distance from the origin along the negative x axis. A third particle carrying a positive charge is placed on the y axis. Draw an arrow to represent the direction of the vector sum of the forces exerted by 1 and 2 on 3.

To the left

An electron is moving directly towards you in a horizontal path when it suddenly enters a uniform magnetic field that is either vertical or horizontal. If the electron begins to curve upward in its motion just after it enters the field, you can conclude that the direction of the magnetic field is

To the left

An electron is initially moving to the right when it enters a uniform electric field directed upwards. Which trajectory show below will the electron follow?

Trajectory Z

Consider the following statement: when two or more waves overlap, the resultant displacement at any point and at any instant is found by adding the instantaneous displacements that would be produced at the point by the individual waves if each were present alone. True or False?

True

A circular loop of radius R carries current I2 in a clockwise direction. What is the direction of the magnetic force on the long straight wire due to the circular loop, if the wire carries a current to the left?

Upwards, it's attracted to the loop

A plane electromagnetic wave is traveling vertically downward with its magnetic field pointing northward. Its electric field must be pointing

toward the west

Current carrying wires are positioned at the corners of a square. All of the currents have the same magnitude, but some are into the page and some are out of the page. What is the direction of the magnetic force on the wire in the upper left corner in case A produced by the other three wires?

towards the wire in the lower right corner

A beam of light, that is a mixture of red light, yellow light, violet light, blue light and green light, strikes a sheet of glass at an angle of 57 degrees with the normal. You observe that in the glass, the angles of refraction are: 38.1 for red, 37.6 for yellow, 37.2 for green, 36.9 for blue, and 36.5 for violet light. which of these colors travels the slowest in this glass.

violet light

A 2.20microF capacitor that is initially uncharged is connected in series with a 7.5 Ohm resistor and an emf source with Vb=15 V and negligible internal resistance. At the moment after the switch is closed, when the voltage difference across the resistor is (2/7)Vb, what is the voltage difference across the capacitor in terms of Vb?

(5/7)Vb

Charged particles are arranged in an equilateral triangle. The distance between each pair of charges is d. The particles are all the same size and mass but they have different charges. Determine the electric potential energy of the arrangement.

-4kq^2/d

Two point sources, 3 cm apart, are generating periodic waves in phase. A point on the third antinodal line of the wave pattern is 10cm from one source and 8 cm from the other source. Determine the wavelength of the waves, in cm

1.0/1.5

The figure below shows two sources of circular waves with a series of curves labeled from 1 to 9. Each circle represents the location of a spherical wave crest. the curves are the lines of the nodes, locations of destructive interference, and of antinodes, locations of constructive interference. Let d represent the distance between the two sources. All possible lines of nodes and anti-nodes are shown. What is the path length difference, in wavelengths from the two sources for points on line 8?

1.5

The figure below shows a battery connected to four capacitors C1, C2, C3, and C4. If the capacitances are identical with C1=C2=C3=C4=C, then what is the equivalent capacitance in terms of C?

2C/5

A spherical air bubble is embedded in glass, and a ray of light (incident ray I) approaches the bubble as shown below. Which best represents the refracted ray which passes through the bubble?

A

Which of the following five glass lenses is a diverging lens

A

Each of the lettered points at the corner of the cube in the figure represents a positive charge q moving with a velocity v in the direction indicated. The region in the figure is in a uniform magnetic field B, parallel to the x-axis and directed toward the right. Which charges experience a force due to B?

A, B, D, and E

Identical rectangular wire loops are moving with velocities and accelerations as shown into ,within, or out of a region in which there is a uniform external magnetic field coming out of the page. At the instant shown various portions of the loops are within the field. Identify the loops for which the direction of the induced current in the loop is clockwise

A, F, and G

Six resistors are shown in the figure. All six are connected to a circuit producing the electric potentials at the ends of the wires show. Identify the wires that carry a current traveling from left to right.

A. (5V and 3V) B. (4V and 1V) E. (14V and 11V)

Current-carrying wires are positioned at the corners of the square. All the currents have the same magnitude, but some are into the page and some are out of the page. Rank the magnitude of the net magnetic field at the center of the square.

A=B<C<D

All of the bulbs in the circuits below are identical (so they have equal resistances), as are all the batteries (meaning they have equal voltage). The batteries have no internal resistance and the wires are ideal (zero resistance). Rank the magnitude of the potential difference between points M and N

A=B=C=D

A velocity selector operates with magnetic and electric fields of magnitudes 0.83T and 6.0x10^6N/C. The following ions are sent through this detector: He2+, N2+, Cl3+, K+, Fe6+. Rank the ions based on the speed they must move at to go through the detector in a straight line.

All are equal

The figures below show identical current-carrying wire segments in identical uniform magnetic field regions. All the magnetic field regions are the same width and height. The fields point into the page. Rank the strength of the magnetic force on the wire segments.

All are equal

Two identical point sources are generating waves with the same frequency and amplitude. The two sources are in phase with each other, so the two sources generate wave crests at the same instant. The wavelength of the waves is equal to the distance between the two sources. Rank the max amplitude of the wave at the labeled points

B<A=C=D

Which one of these diagrams does not provide sufficient information to determine if specular or diffuse reflection is occurring?

C

In each case shown below, charged particles are arranged in identical equilateral triangles. the particles are all the same size and mass but they have different charges. Rank the electric potential energy of the six arrangements.

C<A<B<E<D<F

the figures below show current-carrying circular loops. The current in each loop, the radius of the loops, and the number of turns making up the loop are given.

C<D<B<A=F<E

In these cases, three long, straight parallel wires carry currents either into or out of the page. Point P is midway between the top two wires. The current has the same magnitude in all wires. Rank the strength of the total magnetic field at point P.

C=D<B=E<A

Six identical rectangular wire loops are moving to the right at the same speed in the vicinity of a region with uniform magnetic fields. The strengths of the magnetic fields vary as indicated. All loops contain a one ohm resistor that is not shown. Rank the magnitude of the voltage across the resistor in the loop at the instant shown.

C=E<F<B<A=D

In both cases shown, a light ray traveling in water bends at the surface of a cube. The cases are identical except that the cube in case A is made of a different material than the cube in case B. In which cube does light travel faster, the one in Case A, the one in case B, they travel at the same speed, or there is no way to tell.

Case B

the image portrays 5 situations involving two media separated by a horizontal boundary. waves traveling in the upper medium are incident on the horizontal boundary and enter the medium below the boundary. There is no variation in wave speed within a medium. The figure portrays the waves as a series of wavefronts approaching the boundary in the upper medium and moving away from the boundary in the lower medium. Which situation accurately describes what would occur if the wave's speed is slower in the upper medium

Case N

Two conductors, in the form of concentric spherical shells, are shown below. The spheres have equal magnitude, but opposite-signed charges. The total charge on each sphere has a magnitude 20nC and the potential difference between the surfaces is 100 J/C. If the potential difference between the conductors is increased to 250 volts, then which of the following quantities changes?

Charge changes, but not capacitance

The graph of electric potential versus position in the x-direction for a region is graphed below. Six positions in this region are labeled. At which of the labeled positions would a positive charge experience an electric force in the positive x-direction?

D

Two equal and opposite charges are fixed to a grid at the locations shown. Four points in the vicinity of these charges are labeled A-D. Rank the electric potential at the labeled points from least to greatest .

D<A=C<B

Rank the circuits based on the equivalent resistance connected to the battery. The resistors have equal resistance and all batteries are identical.

D<B=F<E=A<C

In each case, four charged particles, each with a charge magnitude Q, are fixed on grids. The cases are identical except for the signs of the charges. Rank the magnitude of the electric field at the location marked with an "x"

D=A<C<B

All the resistors in the circuits below are identical. The switch in each case is open. Rank the voltmeter readings.

D=C<A<B

The image shows a charged particle moving to the right with velocity v. The moving charge creates a magnetic field around it. Eight points, equally distant from the charge, are labeled with A through H. Rank the 8 points based on the the magnitude of the magnetic field created by the charge.

D=H<A=C=E=G<B=F

The battery shown in the circuit in the figure has some internal resistance. When the switch S is closed, the reading of the voltmeter V will

Decrease

Three objects each with a mass of M exert gravitational forces on each other. Show the direction of the net force on mass B.

Diagonal Left-Down

A metal bar slides without resistance on two parallel metal rails. The bar is moving to the right because a person gave the bar a push to the right. What is the direction of induced current in the bar and the direction of the magnetic force exerted on the bar?

Induced current is counterclockwise; magnetic force on the bar is to the left

A wire carrying a current in the direction shown in the figure passes between the poles of a horseshoe magnet. What is the direction of the magnetic force on this wire due to the magnet?

Into the paper

Consider the circuit with a battery, 3 bulbs, and one initially open switch. The internal resistance of the battery is so low compared to the bulb's resistance that we can treat the battery as having zero internal resistance. What happens to the current through bulb C when you close the switch?

It decreases

A cylindrical rod has resistance R. If we triple its length and diameter, what is its resistance, in terms of R?

R/3

Consider the network of resistors shown below. The current through R1 equal which of the following?

R3+R4+R2

The figure shows a rectangular flat area in a uniform magnetic field. Rank the magnetic flux through the area in the three cases

Right<Middle<Left

Charge flows across the membrane of a cell, in the form of positive and negative ions. The magnitudes of the charge of the ions are the same, only their sign differs. The table lists the number of ions of each type that cross the membrane, either exiting or entering the cell. Which case(s) has current entering the cell

St. Louis and Cincinnati

Suppose you cut off part of the compass needle shown that is painted gray. You discard this part, drill a hole in the remaining red part, and place the red part on the pivot at the center of the compass. Will the red part still swing when a current is applied as in the bottom part of the figure?

Yes

The capacitor in the figure is initially uncharged. The switch is closed at t=0. Long after the switch is closed (hence the capacitor has reached its maximum charge", what is the voltage drop across R3?

Zero

The diagram shows a ray of light entering a type of prism across side AB, undergoing total internal reflection at side BC and exiting through side AD. Side BC might form a boundary with air or a second prism. In which of the following situations will the largest critical angle exist at side BC, if the index of refraction of the prism shown in the figure is 1.55? When the prism shown is bounded on side BC by

a second prism with index equal to 1.50

The figure shows a dipole on the y-axis and a positive ion on the +x-axis. The center of the dipole is at the origin, xo +q and -q are equally distant from the origin. The dipole exerts a downward force on the ion. How does the torque cause the dipole to rotate?

counterclockwise

A tube is wrapped with two windings of insulated wire wound in opposite directions. Terminals a and b of winding A may be connected to a battery through a reversing switch. Is the induced current in the resistor R from left to right or from right to left if the current in winding A is from b to a and is decreasing.

from right to left

In both cases, an aquarium is partially filled with water, and a layer of oil is floating on top of the water. The two cases are identical except for the type of oil used. In Case A, a laser beam in the water totally reflects off of the oil/water boundary as shown. In Case B, the same laser beam refracts at the oil/water boundary as shown. The index of refraction of oil is

greater in case B

A laser beam traveling air enters water at an angle of 60 degrees with respect to the surface and is bent in water to an angle of phi from the surface as shown in case A. Case B involves glass, which has a greater index of refraction than water. If the water is replaced by glass, is the angle with respect to the surface that the laser beam is bent i. greater than ii. smaller than, or iii. equal to phi

greater than

Two particles, X and Y, are 4m apart. X has a charge of 2Q and Y has a charge of Q. The force of X on Y:

has the same magnitude as the force of Y on X

The figure shows a magnet in a uniform magnetic field. The magnet is pivoted at its center. i. What is the direction of the torque on the magnet? ii. What direction does the torque make the magnet rotate in?

i. The torque points into the page ii. the magnet rotates clockwise

The electric field for a plane electromagnetic wave traveling in the positive y direction is shown. Consider a point where E is in the positive z direction. The B field is

in the positive x direction and in phase with the E field

Let fo and fe be the focal lengths of the objective and eyepiece of a compound microscope. In ordinary use, the object:

is more than fo from the objective

Light having a certain frequency, wavelength, and speed is traveling through empty space. If the frequency of this light were doubled, then

its wavelength would be halved, but its speed would remain the same

A concave refracting surface is one with a center of curvature

on the side of the incident light

An object is 30 cm in front of a converging lens of focal length 10 cm. The image is

real and smaller than the object

The figure shows a current-carrying loop placed in a uniform magnetic field. The magnetic field points in the =z direction and the direction of the current around the loop is indicated in the figure. In the figure, the loop is rotated about the y-axis so that on side of length a is above the xy-plane and the other is below. What are the directions of the forces on the sides of the loop of length a?

side below the xy-plane: -x, side above the xy-plane: +x

The figure shows the schematic diagram of an alternator. A conducting loop rotates in a magnetic field, producing an emf. The angular frequency of the rotation is also shown in the figure, w. If the angular frequency is tripled, then which of the statements correctly describes the effect this has on the emf?

the amplitude of the emf increases as does the number of times per second the emf reverses directions

When glasses are used to correct nearsightedness, where should the corrective lens form an image of an object located at infinity in order for the eye to form a clear image of that object

the lens should form the image at the far point

When glasses are used to correct farsightedness

the lens should form the image at the near point

The position of the mth bright band, ym, produced by two point sources, when the angles are small is given by ym = rmlambda/d where d is the distance between the two screens. Fill in the blank: Increasing the distance between the sources, d, by a factor of 2 would cause the position of the ym bright band to

be cut in half

A circular loop of wire is suspended by a thread. A permanent magnet is moved at a constant speed toward the center of the loop as shown. Which statement is correct?

An induced current flows down the front side (near side) and up the back side (far side) of the loop