Phys quiz electric foces and what not

What is the “downhill” direction for electric potential?

The direction of the electric field.

Does the electric field point toward higher potential or lower potenti

Lower potential

In the absence of non-electric forces, which way does a positive charge accelerate?

Toward lower potential.

Why does a positive charge accelerate toward lower potential?

Because positive charges feel force in the same direction as the electric field.

In the absence of non-electric forces, which way does a negative charge accelerate?

Toward higher potential

Why does a negative charge accelerate toward higher potential?

Because negative charges feel force opposite the electric field.

How do you tell if work is positive?

Work is positive when force and displacement point in the same direction.

How do you tell if work is negative?

Work is negative when force and displacement point in opposite directions.

How do you tell if work is zero?

Work is zero when force and displacement are perpendicular.

Work is zero when force and displacement are perpendicular.

W=Fdcosθ

What happens to electric potential energy when a positive charge moves to higher potential?

It increases

What happens to electric potential energy when a negative charge moves to higher potential?

It decreases.

For a positive charge, if voltage VVV increases, what happens to UUU

U increases.

What equation connects electric potential energy and electric potential?

U=qV

Easy rule: electric field points from ______ potential to ______ potential.

High potential to low potential.

If a negatively charged object moves in the direction of the electric field, is the work done by the electric field positive, negative, or zero?

Negative work.

Why: A negative charge feels force opposite the electric field. So if it moves with the electric field, its force and displacement are opposite.

What happens when two objects have opposite charges?

They attract each other.

Object 1 and Object 2 attract. What does that tell you about their charges?

They have opposite charges.

If Object 1 and Object 2 attract, and Object 2 and Object 3 repel, do Object 1 and Object 3 attract or repel?

They attract.

If Object 1 is negative and Object 1 attracts Object 2, what charge is Object 2?

Positive