3.9 Electric Forces

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

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

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

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

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

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

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

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

Tags

NGSS.HS-PS2-4

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

• The +Q charge

• The −3Q charge

• Both have equal density of field lines

• Neither shows field lines

Tags

NGSS.HS-PS2-4

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

• It stays the same

• It increases

• It decreases

Tags

NGSS.HS-PS2-4