Capacitance and the parallel plate capacitor Quiz
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5 questions, one answer each
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1. What charge is stored by a 2.2 mF capacitor at 6.0 V?
- A. 1.3 × 10⁻² C
- B. 3.7 × 10² C
- C. 2.7 × 10⁻³ C
- D. 1.3 × 10⁻⁵ C
2. A parallel plate capacitor has its plate area tripled and its plate separation tripled. What happens to its capacitance?
- A. It increases by a factor of 9
- B. It decreases by a factor of 3
- C. It increases by a factor of 3
- D. It is unchanged
3. A capacitor has capacitance 3.0 nF in air and 12 nF with a dielectric. What is the relative permittivity?
- A. 0.25
- B. 4.0
- C. 9.0
- D. 36
4. Which statement best describes the effect of polar molecules in a dielectric?
- A. They carry charge from one plate to the other
- B. They increase the field between the plates
- C. They rotate and produce a field opposing the applied field
- D. They remove charge from the plates
5. An isolated capacitor holds a charge of 8.0 µC at 40 V. A dielectric of εᵣ = 2.0 is inserted. What is the new p.d.?
- A. 80 V
- B. 20 V
- C. 40 V
- D. 10 V