Electricity and Magnetism Review

Why did Abigail's hair stand up?

• a buildup of electric charge on something

• a repelling between electrons

• an electric circuit

• a flow of protons

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What happens when a copper wire is connected to both ends of a battery?

• an electrostatic discharge

• an electric current

• a power source

• static electricity

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What is a device made of a battery, a nail, and a copper wire that transforms electrical energy into something else?

• electric generator

• electric motor

• electromagnet

• electric switch

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Sophia rubs a comb with a wool cloth and holds it near some bits of paper.

What is most likely to happen?

• A spark jumps between the paper bits and the comb.

• The paper bits move away from the comb.

• The paper bits are not attracted to the comb.

• The paper bits are attracted to the comb and stick to it.

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What happens when two negatively charged balloons are brought close to each other?

• The balloons neither repel nor attract each other.

• The balloons both gain electric charges.

• The balloons attract each other.

• The balloons repel each other.

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Elijah charges a balloon negatively with wool. What happens if he holds it near a wall, and why?

• The balloon will not stick to the wall because the negatively charged balloon is repelled by the negatively charged wall.

• The balloon will stick to the wall because a negatively charged object is attracted to the negatively charged wall.

• The balloon will stick to the wall because the negatively charged balloon is attracted to the uncharged wall. (It pushes the negatives away and is attracted to the positives)

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What happens when the north pole of one magnet gets close to the south pole of another magnet?

• nothing

• They repel each other.

• They attract each other.

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Which is not an advantage of electromagnets over permanent magnets?

• Electromagnets can be built as big as necessary.

• Electromagnets are found in nature.

• The strength of an electromagnet can be controlled by the amount of current.

• Electromagnets can be turned on and off.

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What role does the battery play in a circuit?

• to slow the flow of electricity

• to be a power source

• to connect the components

• to use electric current

What happens when a wooden rod replaces a metal rod in a circuit with a battery and bulb?

• brighter bulb

• unlit bulb

• warmer bulb

• flashing bulb