Electric Charges

Which is the symbol for a negative electric charge?

• -

• +

• =

• -/+

Which of these charges has the greatest magnitude?

• a charge of -4

• a charge of -1

• a charge of +1

• a charge of +3

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?

• The charges disappeared.

• The charges switched signs

• The charges transferred to another object.

• The charges broke apart into smaller particles.

When rubbing a balloon against your hair, which force is causing electrons to transfer between objects?

• Function

• Fiction

• Friction

• Fraction

The image shows to objects with a similar electric charge. Which statement describes the force that will be exerted due to their charge?

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

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

• There is a force pulling the objects towards eachother.

• 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. Based on the diagram, which statement is true?

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

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

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

• The electric force between A & B is identical to the force between C & 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?

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

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

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

• 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?

• The electric force attracting them decreases.

• The electric force attracting them increases.

• The electric force remains constant.

• There is not enough information to answer this question.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Describe what an electric current is:

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OFF

Tags

NGSS.MS-PS2-3

How are electric currents measured?

• by counting the electrons.

• by measuring the rate of flow of an electric charge.

• by measuring the temperature change of the object with the electric charge.