Electrostatic

11. A capacitor consists of two

1. ceramic plates and one mica disc
2. insulators separated by a dielectric
3. silver-coated insulators
4. conductors separated by an insulator

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12. A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is

1. 50 joules
2. 150 joules
3. 200 joules
4. 250 joules

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13. A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be?

1. Paper capacitor
2. Ceramic capacitor
3. Electrolytic capacitor
4. Any-of the above

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14. A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is

1. 0.024 F
2. 0.12 F
3. 0.6 F
4. 0.8 F

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15. A condenser suitable for D.C. only is

1. metallic plate variable gang condenser
2. metallic paper capacitor
3. oil impregrated paper condenser
4. poled aluminium electrolytic condenser

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16. A dielectric material must be

1. resistor
2. insulator
3. good conductor
4. semi conductor

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17. A field line and an equipotential surface are

1. always parallel
2. always at 90°
3. inclined at any angle 0
4. none of the above

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18. A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance?

1. Ceramic capacitor
2. Mica capacitor
3. Both will have identical value of capacitance
4. It depends on applied voltage

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19. A paper capacitor is usually available in the form of

1. tubes
2. rolled foil
3. disc
4. meshed plates

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20. A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be

1. 5 times smaller than before
2. 5 times greater than before
3. 10 times greater than before
4. 25 times larger than before

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