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Electrostatic and Capacitance

Electrostatic and Capacitance
Electric intensity at any point in an electric field is equal to the at that point.

electric flux
potential gradient
None of these
magnetic flux density

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Electrostatic and Capacitance
Dielectric strength of mica is

30 to 50 kV/mm
10 to 20 kV/mm
50 to 200 kV/mm
300 to 500 kV/mm

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Electrostatic and Capacitance
Five time constants are required for a capacitor to charge fully or discharge fully.

1

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Electrostatic and Capacitance
A 220 Ω resistor is in series with a 2.2 µF capacitor. The time constant is

2.42 µs
24 µs
48 µs
480 µs

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Electrostatic and Capacitance
Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the

Charge on the capacitor increases
Voltage across the plates decreases
Charge on the capacitor decreases
Voltage across the plates increases

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Electrostatic and Capacitance
Capacitors are used for audio frequency and radio frequency coupling and tuning

Ceramic
Mica
Paper
Air

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