University Physics-PHYS 221, Fall 2000, UT Martin

Quiz 4 (Capacitors) NAME___________

____1) The capacitance of a parallel plate capacitor with a plate area A and spacing d is C. A second capacitor is prepared with all of its dimensions twice the first one (the dimensions of the plates as well as the spacing are twice the first capacitor). The capacitance of the second capacitor is _____times of that of the first one.

a) 1 b) 2 c)4 d) 0.5 e) 0.25

_____2) A 2 mF capacitor is charged by connecting it to a 25 V battery. The maximum charge the capacitor will collect is ________.

a) 50 mC b) 25 mC c) 12.5 mC d) 100 mC

____3) The capacitor C₁ of the circuit shown next FIGURE 1

(figure 1)will acquire _______ that of C₂. Assume

C₁ > C₂.

a) more charge than

b) less charge than

c) the same charge as

_____4) Refer to the figure 1. above. If C₁= 2 mF, C₂ = 1 mF, and V_o=10 Volts, the charges of C₁ and C₂ are respectively,

a) 2 mC, 1 mC b) 1 mC, 2 mC c) 2.5 mC, 5 mC d) 20 mC, 10 mC

____5) The capacitor C₁ of the circuit shown next (figure 2) will acquire _______ that of C₂. Assume C₁ > C₂. FIGURE 2

a) more charge than

b) less charge than

c) the same charge as

____6) Refer to the figure 2 above. If C₁= 2 mF, C₂ = 1 mF, and the voltage Vo=3 Volts, the charges of C₁ and C₂ are respectively,

a) 1 mC, 3 mC b) 1 mC, 2 mC c) 2 mC, 2 mC d) 20 mC, 10 mC

___7) The equivalent capacitance in mF of the circuit FIGURE 3

in figure 3 is,

a) 6 b) 1/6 c)12 d) 6/11

____8) The equivalent capacitance in mF of the circuit FIGURE 4

in figure 4 is,

a) 6/5 b) 5/6 c)5 d) 1

____9) Figure 5 shows a circuit consisting of a switch FIGURE 5

and two capacitor, initially charged as indicated.

After the switch has been closed the charges on the

capacitors are

a) 2F has 6C, 1F has 3C

b) 2F has 3C, 1F has 3C

c) 2F has 6C, 1F has 6C

d) 2F has 3C, 1F has 6C

e) 2F has 2C, 1F has 1C

___10) What are the voltages in Volts across each capacitors

in figure 6? Give 3 mF first. FIGURE 6

a) 5,3 b)3,5 c) 3,3 d)5,5