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1.A charge Q exerts a 12 N force on another charge q. If the distance between the charges is doubled, what is the magnitude of the electric force exerted on Q by q?

a. 3N

b. 6 N

c. 9 N

d. 12 N

e. 15 N 

2.Two resistors are connected to each other in series. Which of the following is true?

a. The resistors may have different voltages.

b. The current through each resistor must be the same.

c. The total resistance of the two resistors is determined through simple addition of the two resistors.

d. All of the above.

3.A negatively charged rod is brought near the knob of a positively charged electroscope. The result is that:

a. The electroscope leaves will move further apart

b. The rod will lose its charge

c. The electroscope leaves will collapse

d. The electroscope will neutralize

e. Nothing noticeable will happen until the rod touches the knob.

4.A conducting sphere has a net charge of -4.8×10-17 C. What is the approximate number of excess electrons on the sphere?

a. 100

b. 200

c. 300

d. 400

e. 500 

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