Electric Forces Act on Charged Objects

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

Tags

NGSS.HS-PS2-4

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. The water molecules will rotate so the positive side is closest to the ballon, 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.

Tags

NGSS.MS-PS2-3

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.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

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. +1 A (+1) -1) B (-1) D 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.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

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.

Tags

NGSS.MS-PS2-3

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.

Tags

NGSS.HS-PS2-4