1. Two test charges are brought separately into the vicinity of a charge Q. First, test charge q is brought to point A a distance r  from Q. Next, q is removed and a test charge 2q is brought to point B a distance 2r from Q.

Compared with the electrostatic potential energy of pair of charges in case A, the magnitude of the electric PE in case B is

1. greater
2. smaller
3. the same
4. you can’t tell from the information given

2.Which of these configurations has the largest (magnitude) electric potential energy?

1. A
2. B
3. C
4. D
5. A and C
6. B and D
7. Some other combination

3.  In the figure at the right are shown four configurations of small charges. Each charge has the same magnitude but the blue ones are positive and the red ones are negative. The distance scales are the same in each figure. Rank the configurations by the total value of electric potential energy they have (not magnitude!).

1. B > A = C > D
2. B = D > A = C
3. B > D > A = C
4. B > D > C > A
5. A = B = C = D
6. Something else