1. A charge 5.0 nC is 0.5 m from charge of 8 C. The size of the electric force each charge exerts on the other is, in units of N,

2. Suppose that you work a problem in which you are asked to calculate the electric energy for two known charges separated by a known distance. When you work through the units, they end up as N. Is this correct and if not, what is the likely source of the error?

a. There is no error.

b. Not correct, you forgot to multiply by the constant k.

c. Not correct, probably you squared the distance in the denominator (appropriate for force), giving units of N (J/m) instead of J (N*m).

d. Not correct, you forgot to multiply by one of the charges.

3. The electric force between two charges

a. is always attractive.

b. is repulsive if one charge is positive and the other is negative, otherwise it is attractive.

c. is attractive if one charge is positive and the other is negative, otherwise the force is repulsive.

d. is always repulsive.

4. A resistor is known to be ohmic. You attach a 10 V battery across a certain resistor. You measure the current through the resistor as being 2 A. The resistance of the resistor, in ohms, is

5. A loop consists of a 6 V battery, an 18 V battery, a 2 ohm resistor, and a 4 ohm resistor, in that order. The batteries are arranged with their positive sides connected to each other. The size of the current is, in A,