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Electrostatic and Capacitance

Electrostatic and Capacitance
Which of the following materials has the highest value of dielectric constant?

Paper
Mica
Ceramic
Glass

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Electrostatic and Capacitance
A 10 µF, 20 µF, 22 µF, and 100 µF capacitor are in parallel. The total capacitance is

2.43 µF
152 µF
100 µF
4.86 µF

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Electrostatic and Capacitance
When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of

2 joules
8 joules
6 joules
4 joules

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Electrostatic and Capacitance
Paper condenser is

Electrolytic condenser
None of the listed here
Always polarised
Usually of fixed value

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Electrostatic and Capacitance
For which of the following parameter variation, the capacitance of the capacitor remains unaffected ?

Distance between plates
Thickness of the plates
Nature of dielectric
Area of the plates

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Electrostatic and Capacitance
A 4.7 MΩ resistor is in series with a 0.015 µF capacitor. The combination is across a 12 V source. How long does it take the capacitor to fully charge?

70.5 ms
35 ms
3.5 ms
352 ms

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