电容的测试

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Q1:A parallel–plate capacitor has a capacitance C. A second parallel–plate capacitor has plates with twice the area and twice the separation. The capacitance of the second capacitor is most nearly

¼C

½C

Q2:A 4 μF capacitor is charged to a potential difference of 100 V. The electrical energy stored in the capacitor is

2 × 10^(-10) J

2 × 10^(-8) J

2 × 10^(-6) J

2 × 10^(-4) J

2 × 10^(-2) J

Q3:A sheet of mica is inserted between the plates of an isolated charged parallel–plate capacitor. Which of the following statements is true?

The capacitance decreases.

The potential difference across the capacitor decreases.

The energy of the capacitor does not change.

The charge on the capacitor plates decreases

The electric field between the capacitor plates increases.

Q4:Three identical capacitors each with a capacitance of C are connected as shown in the following diagram. What would be the total equivalent capacitance of the circuit?[图片]

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电容的测试

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