Which statement best describes how distance affects electric force strength in the section?

Greater distance weakens the force

Greater distance has no effect on force

Greater distance strengthens the force

Distance only matters for negative charges

In the electric field line diagram showing +Q near −3Q, which object should have denser field lines, indicating stronger field near it?

Both have equal density of field lines

Which statement best defines electric potential energy in an electric field?

The stored energy due to the interactions of charges in an electric field

The energy of moving charges through a circuit

The energy from a battery’s chemical reactions

The kinetic energy of electrons in a wire

A charged object is described as having an unbalanced amount of positive or negative charge. Which situation shows a positively charged object?

8 positive charges and 6 negative charges

6 positive charges and 9 negative charges

6 positive charges and 6 negative charges

4 positive charges and 4 negative charges

Which statement correctly identifies the object’s charge when it contains 6 positive charges and 9 negative charges?

Overall charge is −3; object is negatively charged

Overall charge is +3; object is positively charged

Overall charge is 0; object is neutral

Overall charge is −9; object is negatively charged

Which statement best defines an electrically neutral object?

It has equal amounts of positive and negative charge.

It has more positive charge than negative charge.

In charging by induction, what happens to the electrons inside a nearby neutral object?

They move within the object, creating oppositely charged sides.

They leave the object permanently.

They stop moving and freeze in place.

A negatively charged balloon is brought close to a neutral aluminum can without touching it. Which outcome is most likely based on induction?

The side of the can near the balloon becomes positive and the can may roll toward the balloon.

Nothing happens because the can is neutral.

The can becomes uniformly negative.

The balloon loses all its charge instantly.

Which phrase completes the sentence: In induction, electrons move within the object making the closest side _______.

more negatively charged than the far side

Which statement best defines an electric insulator?

A material in which charges cannot easily move

A material in which charges can easily move

A material that generates electric charge

A material that converts electrical energy to heat

Which statement best describes charge transfer by conduction?

It happens when charged particles flow between conductors that have unequal charges.

It occurs when charged particles move through a vacuum without contact.

It requires magnetic fields to push charges from one object to another.

It only occurs in insulators that prevent charge movement.

Refer to the diagram titled "Properties of Electric Charges" showing Object A with many negative charges and Object B with fewer. When A and B touch and charges flow until they are equally distributed, which principle is illustrated?

Conservation of charge in a closed system.

Induction causes charge to build up in Object A.

Charges move from lower to higher concentration.

Neutralization makes both objects lose all charge.

A balloon has a negative charge. A glass rod has a positive charge. What will happen when the glass rod is brought near the balloon?

The balloon will be attracted to the rod

The balloon will be repelled by the rod

The balloon will remain in place

The balloon will spin in circles

3.9 Electric Forces

Authored by Rebecca Weitzel

Physics

8th Grade

NGSS covered

Used 1+ times

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31 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement correctly describes how electric charges interact?

Opposite charges repel; like charges attract

Opposite charges attract; like charges repel

Positive charges interact only with other positive charges

Negative charges cannot interact with positive charges

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is an electric field?

A visible glow around a charged object

A path that charges follow through a wire

An invisible region around a charged object that applies an electric force

A physical barrier that stops charges from moving

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the overall interaction shown between the two charges?

Repulsion between the charges

Attraction between the charges

No interaction because the charges are neutral

Random motion of charges

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which scenario best illustrates electric force acting without contact?

A magnet sticking to a refrigerator

A balloon rubbed on hair causing small paper bits to jump toward it

A person pushing a cart

Water flowing through a pipe

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to these electric field lines and their charges’ interaction?

Field lines point toward each other; charges attract

Field lines are straight and neutral; no interaction

Field lines point away from each charge; charges repel

Field lines disappear; charges stop interacting

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which factor, when increased, directly strengthens the electric force between two charged objects according to the lesson?

Increasing the distance between objects

Increasing the amount of charge on the objects

Decreasing the amount of charge on the objects

Changing charge signs to be the same

Tags

NGSS.HS-PS2-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If the distance between the two charges is doubled, what happens?

The force stronger

The force stays the same

The force becomes weaker.

Tags

NGSS.HS-PS2-4

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3.9 Electric Forces

Which statement correctly describes how electric charges interact?

What is an electric field?

What is the overall interaction shown between the two charges?

Which scenario best illustrates electric force acting without contact?

What happens to these electric field lines and their charges’ interaction?

Which factor, when increased, directly strengthens the electric force between two charged objects according to the lesson?

If the distance between the two charges is doubled, what happens?

Which statement best describes how distance affects electric force strength in the section?

In the electric field line diagram showing +Q near −3Q, which object should have denser field lines, indicating stronger field near it?

Two objects carry charges q1 and q2. If q1 is doubled while q2 and r remain the same, how does the electric force change?

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