PHYSICS IS FUN!!

A metal ball hangs from the ceiling by an insulating thread. The ball is attracted to a positive-charged rod held near the ball. The charge of the ball must be:

• Positive

• Negative

• Neutral

• Positive or Neutral

• Negative or Neutral

Two charged balls are repelling to each other as they hang from the ceiling. What can you say about their charges?

• one is positive, the other one is negative

• both are positive

• both are negative

• both are positive or both are negative

What is the magnitude of the force F₂ ?

• 1.0N

• 3.0N

• 6.0N

• 2.0N

A proton and an electron are in constant electric field created by oppositely charged plates. You release the proton from the positive side and the electron from the negative side. Which feels the larger electric force?

• proton

• They feel the same magnitude force but opposite direction

• neither - there is no force

• both feel the same force

Which two points have the same potential?

• C and E

• A and D

• B and D

• E and D

In the circuit shown, what is the voltage across R₁ ?

• 12V

• 0

• 6V

• 8V

What is the current in branch P?

• 2A

• 4A

• 7A

• 6A

Points P and Q are connected to a battery of fixed voltage. As more resistors R are added to parallel circuit, what happens to the total current in the circuit?

• increases

• remains the same

• decreases

• drops to zero

Four point charges are arranged at the corners of a square. Find the electric field E and the potential V at the center of the square.

• E = 0 V = 0

What is the electric potential at point B?

• V=0