1. If the electric potential in some region is given by V (x, y, z) = (4.00 V/m) z + (10.5 V), what isthe z

component of the electric field at (x, y, z) = (0.00 m, 3.00 m, 2.00 m)?

A. −4.00 N/C     B. 4.00 N/C      C. −8.00 N/C       D. 8.00 N/C

2. Two capacitors are connected in series, and a 9.0 V potential difference is maintained across the series combination. The capacitance of one capacitor is C1 = 1.5 µF = 1.5 × 10−6 F, and the other is C2 = 2.7 µF. Which capacitor has a larger potential difference between its plates?

A. C1   B. C2          C. The potential difference is the same because the capacitors are in series.

3. A parallel-plate capacitor carries charge Q and has very small plate separation d compared with the length L along the edge of a plate (where each plate has area A = L2). Gauss’s Law can be used to show that the electric field strength in between the plates is

A. A(epsilon0)/Qd       B. A(epsilon0)/2Qd      C. Q/A(epsilon0)   D. Q/2A(epsilon0)   E. 0

5. A charged pith ball is brought very close to (but not in contact with) end “A” of a neutral conductingrod (shown below), and it attracts the rod. If the same pith ball is now brought very close to(but not in contact with) end “B” the rod will…

A. Be attracted to the charged pith ball.          B. Be repelled from the pith ball.          C. Not feel a force at all.

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