Lesson 7.04Conductors
Lesson 7.05 Capacitors
Self-Check Quiz
1. A hollow metal sphere is charged to a potential of 40V. The potential at its center is ______.
a. 40V
b. 0
c. -49V
d. 80V
e. -80 V
f. Depends on the radius of the sphere
Answer: _____
2. The capacitance of a parallel plate capacitor is ______.
a. proportional to charge
b. proportional to the plate separation
c. proportional to the area of the plates
d. proportional to the potential difference
e. None of the above
Answer: _____
3. A 6.00µF parallel plate capacitor has a charge of +40.0 µC. What is the potential energy stored in this capacitor?
a. 103 µJ
b. 113 µJ
c. 123 µJ
d. 133 µJ
Answer: _____
4. A parallel plate capacitor has plate separation of 4.0 cm and a plate area of 4.0*10-2 m2. What is the capacitance of this capacitor?
a. 8.9*10-12 F
b. 8.9*10-13 F
c. 8.9*10-14 F
d. 8.9*10-15 F
Answer: _____
5. A parallel plate capacitor is connected to a battery that maintains a constant potential difference. How will the electrical energy stored on the capacitor change if the separation between the plates is doubled?
a. It will double.
b. It will quadruple.
c. It will be cut in half.
d. It will not change.
Answer: _____
6. The electric field of an isolated, uniformly charged metallic sphere is greatest ______.
a. at the center of the sphere
b. at the sphere's inner surface
c. at infinity
d. at the sphere's outer surface
Answer: _____
7. The electric field just outside of a conductor that is in electrostatic equilibrium ______.
a. is zero
b. is at its minimum level
c. is the same as it is in the center of the conductor
d. is perpendicular to the conductor's surface
Answer: _____
8. Find the charge of a 2F capacitor charged to 100V.
a. 100C
b. 200C
c. 300C
d. 400C
Answer: _____
9. How much energy is stored in a 1.5F capacitor that is connected to a 9.0-V battery?
a. 1.7*10-3 J
b. 6.1*10-5 J
c. 7.5*10-3 J
d. 5.4*10-3 J
Answer: _____
10. What is the charge on a 0.25F capacitor when the capacitor is connected to a 9.0-V battery?
a. 1.2*10-12 C
b. 2.2*10-6 C
c. 2.8*10-8 C
d. 3.6*10-7 C
Answer: _____