Question 1

The light bulbs in this circuit are connected in

Accepted Answer

A)   parallel.
B)   series.
C)   neither parallel nor series.
D)   a short circuit.

Question 2

Two charged bodies separated by a distance d exert a repulsive electrical force on each other. The signs of the charges on the two bodies might be

Accepted Answer

A)   + and +.
B)   - and -.
C)   + and -.
D)   any of the above.
E)   not determinable.

Question 3

A battery stores electric charge in the same way that a bottle stores water.

Accepted Answer

A) True 
 B)False

Question 4

Two charged bodies separated by a distance d exert an attractive electrical force on each other. The signs of the charges on the two bodies are __________ and __________.

Accepted Answer

The answer of Two charged bodies separated by a distance...

Question 5

If the diameter of a wire increases, its resistance

Accepted Answer

A)   increases.
B)   decreases.
C)   does not change.
D)   will increase or decrease depending on the composition.
E)   will change in a way that can not be determined.

Question 6

In a parallel circuit, the size of the current flowing through each device may be different.

Accepted Answer

A) True 
 B)False

Question 7

Why do you hear thunder a substantial time after seeing a lightning flash?

Accepted Answer

A)   The sound is produced later than the light is.
B)   Your eyes respond more quickly than your ears.
C)   The flash and thunder really are simultaneous, but the thunder lasts longer than the flash.
D)   Sound travels much more slowly than light.

Question 8

How much energy does a 100-watt light bulb use in 1 hour?  Express your answer in (a) joules and in (b) kilowatt-hours. (c) Also find how much money it costs if electricity sells for 10 cents per kW-h.

Accepted Answer

(a 360,000...

Question 9

Larger batteries have higher output voltages.

Accepted Answer

A) True 
 B)False

Question 10

A charged particle creates an electric ________ in the space around it.

Accepted Answer

The answer of A charged particle creates an electric ________...

Question 11

The electric field shown is produced by a single point charge at the center of the picture.  What force might a charge placed at location D feel?

Accepted Answer

A)   zero
B)   an upward force
C)   a downward force
D)   a force to the right
E)   a force to the left

Question 12

If the length of a wire increases, its resistance

Accepted Answer

A)   increases.
B)   decreases.
C)   does not change.
D)   will increase or decrease depending on the composition.
E)   will change in a way that can not be determined.

Question 13

Superconductivity is lost when a certain ____is exceeded.

Accepted Answer

A)   voltage
B)   current
C)   resistance
D)   electric field
E)   critical temperature

Question 14

An object that has zero resistance is a __________.

Accepted Answer

The answer of An object that has zero resistance is...

Question 15

Lightning is dangerous to humans because lightning strokes

Accepted Answer

A)   carry large currents.
B)   have high voltages.
C)   have no resistance.
D)   fry whatever they hit.

Question 16

Superconductivity is lost when a certain critical temperature is exceeded.

Accepted Answer

A) True 
 B)False

Question 17

A car headlight and an interior dome light use the same voltage, but the headlight consumes much more power because

Accepted Answer

A)   its resistance is lower.
B)   the current in it is larger.
C)   it uses energy faster.
D)   all of the above

Question 18

A quantity that measures the opposition to the flow of charge is

Accepted Answer

A)   voltage.
B)   current.
C)   resistance.
D)   electric field.
E)   critical temperature.

Question 19

What is meant by 'net charge?'

Accepted Answer

A)   the total amount of positive charge on an object
B)   the total amount of negative charge on an object
C)   the total amount of neutral charge on an object
D)   A minus B

Question 20

In a thunderstorm cloud, the concentration of negative charge is in the __________ portion of the cloud.

Accepted Answer

The answer of In a thunderstorm cloud, the concentration of...

Exam 7: Electricity

The electric field shown is produced by a single point charge at the center of the picture. What force might a charge placed at location D feel?

Correct AnswerverifiedShow Answer

In a thunderstorm cloud, the concentration of negative charge is in the __________ portion of the cloud.

Correct AnswerverifiedShow Answer

How much energy does a 100-watt light bulb use in 1 hour? Express your answer in (a) joules and in (b) kilowatt-hours. (c) Also find how much money it costs if electricity sells for 10 cents per kW-h.

Correct Answerverified(a 360,000...View AnswerShow Answer

Two charged bodies separated by a distance d exert a repulsive electrical force on each other. The signs of the charges on the two bodies might be

Correct AnswerverifiedShow Answer

If the diameter of a wire increases, its resistance

Correct AnswerverifiedShow Answer

Superconductivity is lost when a certain ____is exceeded.

Correct AnswerverifiedShow Answer

An object that has zero resistance is a __________.

Correct AnswerverifiedShow Answer

The light bulbs in this circuit are connected in

Correct AnswerverifiedShow Answer

In a parallel circuit, the size of the current flowing through each device may be different.

Correct AnswerverifiedShow Answer

A charged particle creates an electric ________ in the space around it.

Correct AnswerverifiedShow Answer

Lightning is dangerous to humans because lightning strokes

Correct AnswerverifiedShow Answer

A battery stores electric charge in the same way that a bottle stores water.

Correct AnswerverifiedShow Answer

If the length of a wire increases, its resistance

Correct AnswerverifiedShow Answer

A quantity that measures the opposition to the flow of charge is

Correct AnswerverifiedShow Answer

Superconductivity is lost when a certain critical temperature is exceeded.

Correct AnswerverifiedShow Answer

Two charged bodies separated by a distance d exert an attractive electrical force on each other. The signs of the charges on the two bodies are __________ and __________.

Correct AnswerverifiedShow Answer

What is meant by 'net charge?'

Correct AnswerverifiedShow Answer

A car headlight and an interior dome light use the same voltage, but the headlight consumes much more power because

Correct AnswerverifiedShow Answer

Larger batteries have higher output voltages.

Correct AnswerverifiedShow Answer

Why do you hear thunder a substantial time after seeing a lightning flash?

Correct AnswerverifiedShow Answer

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Two charged bodies separated by a distance d exert an attractive electrical force on each other. The signs of the charges on the two bodies are and .

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