6.11 Unit 6 Test: Part 1, 7.01 Quiz: Static Electricity, 7.02 Quiz: Electric Force, 7.03 Quiz: Electric Fields, 7.07 Quiz: Electrical Potential Difference, 8.01 Quiz: Currents and Circuits, 8.02 Quiz: Current Electric Forces, 8.04 Quiz: Parallel Circ...
In an electric field of strength 0.50 N/C, a test charge experiences a force of 2.50 × 10^-4 N in the same direction as the field. What is the magnitude of the test charge?
+5.00 × 10^-4 C
A point charge of +1.0 µC is moved in the direction of an electric field, and it has a change in electric potential difference energy of 10.0 J. What was the change in electric potential difference? 1 µC = 10^-6 C
-1.0 × 10^7 V
An object with a charge of +6.0 µC is 0.30 m from a second object and experiences an attractive force of 1.80 N. What is the magnitude of the charge on the second object?
-3.0 μC
Each side of a square loop of wire measures 2.0 cm. A magnetic field of 0.044 T perpendicular to the loop changes to zero in 0.10 s. What average emf is induced in the coil during this change?
0.00018 V
Two identical objects each with a charge of +3.0 µC experience a repulsive force of +0.90 N between them. How far apart are the objects?
0.30 m
When a 20 V battery is hooked up to a 50 Ω resistor in a circuit, how much current flows through the circuit?
0.4 A
A 10.0 Ω resistor is in parallel with a 20.0 Ω resistor and supplied by a 9.0 V battery. What is the current passing through the 20.0 Ω resistor?
0.45 A
If 2.0 × 10^-4 C of charge passes a point in 2.0 × 10^-6 s, what is the rate of current flow?
1.0 × 10^2 A
A voltmeter reads 200.0 V between parallel plates that are 2.0 cm apart. What is the strength of the electric field between the two plates?
1.0 × 10^4 N/C
A straight 1.2 m length iron rod is moved at 10 m/s through the earth's magnetic field at a location where it has magnitude 1.0 × 10^-5 T. What is the magnitude of the induced emf between one end of the wire and the other end?
1.2 × 10^-4 V
A 10.0 Ω resistor is in parallel with a 20.0 Ω resistor and supplied by a 9.00 V battery. What is the total current passing through the circuit?
1.35 A
What is the equivalent resistance of a parallel circuit with a 5.0 kΩ resistor, a 2.5 kΩ resistor, and 10.0 kΩ resistor?
1.4 kΩ
One 10.0 Ω resistor is wired in series with two 10.0 Ω resistors in parallel. A 45.0 V battery supplies power to the circuit. What is the current passing through each of the 10.0 Ω resistors in the parallel portion of the circuit?
1.5 A
Which of the following is equivalent to one ampere?
1.5 C/1.5 s
If 4.0 × 10-18 J of work done on a point charge changes its electric potential difference by 25.0 V, then what is the magnitude of the charge?
1.6 × 10^-19 C
Suppose a magnetic field of 0.20 T is applied to the area within a circular loop of wire. The strength of the field is then changed to 0.10 T. By what factor is the magnetic flux changed?
1/2
Which of the following is a reasonable power rating on an electric oven?
10.0 kW
If 112 C flows past a point in 10.0 A of current, then how much time elapsed?
11.2 s
You are standing in front of a large, flat mirror at a distance of 2.0 m from the mirror. A friend stands 1 m to your right. What does your friend see as the position of your reflection in the mirror?
2.0 m behind the mirror, directly in front of you
If a +1.0 µC point charge is moved in an electric field to produce a +200.0 V change in potential, then how much work was done? 1 µC = 10^-6 C
2.0 × 10^-4 J
When 2.0 A of current moves across a 1.0 MΩ resistor, then what is the drop in voltage (ΔV) across the resistor?
2.0 × 10^6 V
An electric oven has a resistance of 101 Ω and a voltage of 220 V. How much current does it draw?
2.2 A
A stream of moving charges results in a current of 5.6 A. How long does 116 C of charge take to flow past a fixed point?
21 s
Which of the following is an appropriate measure of electric power on a toaster label?
220 W
How much power does a radio use if a 12.0 V battery supplies 2.0 A of current?
24 W
The primary coil of a transformer has 1,000 turns of wire, and its secondary coil has 2,000 turns of wire. The input voltage is 140 V. What is the output voltage of the transformer?
280 V
When a 20 V battery is hooked up to a 10 Ω resistor in a circuit, how much current flows through the circuit?
2A
A 10.0 Ω resistor is in parallel with a 30.0 Ω resistor and a 5.0 Ω resistor. What is the equivalent resistance of this circuit?
3.0 Ω
A wire carries a current of 5.2 A from east to west through a 6.0 m section of wire in the earth's magnetic field of 1 × 10^-5 T at a location where the magnetic field points south. What is the magnitude of the magnetic force acting on the wire?
3.1 × 10^-4 N
Suppose Galileo and his assistant were 1 km apart when Galileo uncovered his lantern to try to measure the speed of light. How long would it have taken the light signal to reach his assistant?
3.3 × 10^(-6) s
Suppose a magnetic field of 1.0 T is applied to an area within a circular loop of wire. The strength of the field is then increased to 4.0 T. By what factor is the magnetic flux changed?
4
The current in a solenoid is changed from 1.1 A to 4.4 A. By what factor does the magnitude of the magnetic field inside the solenoid increase?
4
If a beam of light from a He-Ne laser has wavelength 543 nm in air, what is its wavelength in water? The index of refraction for water is 1.33.
408 nm
What is the critical angle θc for total internal reflection if the material is clear acrylic, with a refractive index of 1.5?
42°
How many coulombs could be in a lightning bolt?
5.0 x 10^0 C
If a 10.0 kW device pulls 20.0 A of current, what voltage exists across it?
5.0 × 10^2 V
The current through a device is 0.30 A, and the resistance in the device is 30 Ω. How many 1.5 V batteries are required to run the device?
6
A 10.0 Ω resistor is in parallel with a 30.0 Ω resistor and supplied by a 45.0 V battery. What is the total current drawn from the battery?
6.00 A
The light emitted by an argon laser light includes light with a wavelength of 488 nm. What is the frequency of this light?
6.15 × 10^14 Hz
Which of these is an example of electromagnetic induction?
A changing magnetic field induces an electromotive force.
What produces the light from a fluorescent light bulb?
A coating on the tube converts UV light into visible light.
In which case is there an induced electromotive force?
An electromagnet operating on alternating current is held inside a second coil of wire.
Which of the following statements is true about the Bohr model of the atom?
An electron orbits in spherical orbits at discrete distances from the nucleus.
Why do photoelectrons all have the same energy when illuminated with a given frequency of light?
Each photon has the same energy, which gets transferred to a single photoelectron.
What is a major difference between the quantum model of the atom and the Bohr model?
Electron orbitals are redefined as probable regions where the electron could be located.
Who first developed the lightning rod?
Franklin
Which of these is true about a bar magnet?
It attracts unmagnetized iron objects by making them magnetically polarized.
Which of these is true about a magnetic field?
It points in the same direction as it would make a compass point.
What does a capacitor do in a circuit?
It stores charge.
Which of these is true about the magnetic field of a bar magnet?
Its direction at each location is the same direction it would tend to make a compass point.
Which of these is true about a bar magnet?
Its poles cannot be separated into two isolated poles.
What did Young's observation of an interference pattern for light show about the nature of light?
Light behaves as a wave.
Object A experiences an attractive force of 50 N when it comes close to Object B. If Object A is positively charged, what can you say about Object B?
Object B is negatively charged.
If you charge a comb by rubbing it against fur and place it near scrap bits of paper, what will happen?
The comb will attract the bits of paper by charge polarization.
Why does a compass needle usually point north?
The earth is a magnet with its south magnetic pole located in the north.
Which of the following would be true if a test charge were negative instead of positive?
The field lines for negative source charges would point outward.
Two point charges of opposite sign are brought close together. Which statement best describes the field lines of the combined point charges?
The field lines from the positive charge point toward the negative charge.
A ferromagnetic material is subjected to a strong magnetic field and afterward acts as a permanent magnet. Why does this occur?
The magnetic field aligns the magnetic domains mainly in one direction.
During induction with a negatively charged object, which of the following happens?
The negatively charged object repels electrons from the surface of a second object, thereby producing a positively charged surface.
You plug a string of 100 lights in series into a 120 V power outlet, and each light has a resistance of 3.00 Ω. If each light has a power rating of 0.50 W, what will happen?
The string will remain lit.
How will the total voltage of a string of light bulbs in series change as you add more bulbs to the string?
The total voltage will stay the same.
A maglev train requires which of the following?
The track and the train must have the same magnetic poles.
A car approaches a police radar gun. How does the wavelength of the signal detected within the car compare with that emitted by the radar gun?
The wavelength detected inside the car is shorter.
Which of these is not true about magnetic field lines?
They are perpendicular to the direction of the magnetic field at each point.
Which statement best describes how you map an electric field?
You place a test charge at various distances from the source and determine the magnitude of the field at each point.
What produces the emf in an electric generator?
a coil rotating in a magnetic field to change its flux
What is a capacitor?
a component that stores charge
A convex mirror has a focal length of 40 cm. You place an object on the principal axis 20 cm in front of the mirror. What kind of image forms, if any?
a virtual image smaller than the object
A cool gas cloud is situated between a bright star and the earth. What type of spectrum would you expect to observe through that gas cloud?
absorption spectra
Which of the following types of spectra have dark lines?
absorption spectra
Which of the following is required for electric current to flow?
battery and copper wire
Which part or parts of the eye change the direction of light rays to form an image?
both the lens and cornea
How did Michelson measure the speed of light?
by using rotating mirrors to measure the time of round trip travel of light to a distant mountain
Positively charged Object A is brought close to neutral Object B but does not touch it. The two objects begin to attract each other. What is this process called?
charge polarization
What shape do magnetic field lines have around a wire with a steady current in it?
concentric circles around the wire
What effect does a diffraction grating have on white light?
creates a spectrum by producing intensity maxima in different directions for different wavelengths
An ampere is the SI unit of which of the following?
electric current
Which of the following is responsible for the flow of electrons in a circuit?
electromotive force
What accounts for absorption spectra of elements?
electrons moving from low energy levels to high energy levels
Which of the following properties of light can only be explained by wave theory?
interference
Which three elements are ferromagnetic?
iron, nickel, and cobalt
Which of these elements is not ferromagnetic?
magnesium
What material is generally believed to have formed the first magnets to be discovered?
magnetite
What were the earliest naturally occurring magnets made of?
magnetite
Which of the following objects is considered negatively charged?
one with excess electrons on the surface
In which direction do electric field lines emanate from a charged object?
perpendicular to the surface of the source charge
Which of these has the longest wavelength?
radio waves
What kind of image does the lens system of the eye form on the retina?
real and inverted
When you stand by the side of a pool, someone swimming underwater appears to be in a different location than she really is. This effect is caused by __________.
refraction
A rainbow results from the way that light of different wavelengths __________.
refracts differently within water drops
Which of these does not result directly in reflection?
shining light from a spacecraft into space
A current flows from east to west in a long wire. When you place a compass right under the wire, which direction will it point?
south
A length of wire 12.0 m long carries a current of 10 A straight upward. In which direction will a compass placed alongside the west side of the wire point?
south
What is the electromagnetic spectrum?
the complete collection of electromagnetic waves, from radio waves to gamma rays
What produces the force for the torque that turns an electric motor?
the force on a current in a magnetic field
What is the source of the magnetic field in a permanent magnet?
the spin and orbital motion of electrons
Which of the following is a charged object?
thunderclouds
A 6.0 m section of wire carries a current of 5.2 A from east to west in the earth's magnetic field of 1.0 × 10^-5 T at a location where the magnetic field points south. In which direction does the magnetic force act on the wire?
up
Which of the following SI units is the unit of electric potential difference?
volt
Which of these is a unit of electromotive force?
volt
