How Can Charged Objects Interact Without Touching

Which of these charges has the greatest magnitude?

• A. a charge of –4

• B. a charge of –1

• C. a charge of +1

• D. a charge of +3

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When Bethany walks across a carpet, her socks pick up many electric charges. Later in the day, these charges are no longer present on her socks. What most likely happened to the charges?

• A. The charges disappeared.

• B. The charges switched signs.

• C. The charges transferred to another object.

• D. The charges broke apart into smaller particles.

An inflated, negatively charged balloon is moved toward a stream of water from a faucet. What will happen to the water molecules?

• A. They will develop a slightly positive charge so the water moves toward the balloon.

• B. They will develop a slightly positive charge so the water moves away from the balloon.

• C. They will develop a slightly negative charge so the water moves toward the balloon.

• D. They will develop a slightly negative charge so the water moves away from the balloon.

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This image shows two circular objects. Each object has an electric charge, as shown.

Which statement describes the force that is exerted on the objects due to their electric charge?

• A. There is a force pushing both objects to the left.

• B. There is a force pulling the objects toward each other.

• C. There is a force pushing the objects away from each other.

• D. There is no force on the objects due to their electric charge.

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The diagram shows two pairs of charged objects. Objects A and B are interacting with each other, and objects C and D are interacting with each other.

Based on the diagrams, which statement is true?

• A. There are no electric forces because the charges in each pair of objects cancel.

• B. The electric force between A and B is smaller than the electric force between C and D.

• C. The electric force between A and B is greater than the electric force between C and D.

• D. The electric force between A and B is identical in magnitude to the electric force between C and D.

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What happens when a rubber rod is rubbed with a piece of fur, giving the rod a negative charge?

• A. Negative charges are moved from the rod to the fur.

• B. Negative charges are moved from the fur to the rod.

• C. Negative charges are added to the rod, and the fur remains neutral.

• D. Positive charges are removed from the rod, and the fur remains neutral.

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The distance between a positively charged object and a negatively charged object increases. If everything else remains constant, what happens to the electric force between the objects?

• A. The electric force decreases.

• B. The electric force increases.

• C. The electric force remains constant.

• D. There is not enough information to answer this question.

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Which statements describe how the electric force affects the balloons? Choose all that apply.

• A. The balloons are pulled together by the electric force.

• B. The balloons are pushed apart by the electric force.

• C. The balloons stick together once they are touching because they need to be in contact to be affected by the electric force.

• D. If the balloons move closer together, the electric force acting on them increases.

• E. If one of the balloons becomes positively charged, the electric force increases.

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The packing peanuts are removed from the comb and placed on the table. Then the positively charged wool cloth is held close to the packing peanuts. What will happen to the packing peanuts?

• A. They will stick to the wool cloth.

• B. They will be pushed away from the wool cloth.

• C. They will not be affected by the wool cloth.

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The stationary charges on the surface of a balloon can produce a(n) ____________.

• current

• electric force

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