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Electrostatic and Capacitance

Electrostatic and Capacitance
Acharge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 10 N, is known as

pico-coulomb
coulomb
micro-coulomb
milli-coulomb

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Electrostatic and Capacitance
A capacitance of 100 fiF is connected in series with a resistance of 8000 £2. The time constant of the circuit is

0.4 s
0.6 s
1.2 s
0.8 s

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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
480 µs
48 µs
24 µs

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Electrostatic and Capacitance
Capacitors are mainly used for radio frequency tuning.

Mica
Air
Electrolytic
Paper

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Electrostatic and Capacitance
The dissipation factor of a good dielectric is of the order of

2.0
0.0002
0.002
0.2

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Electrostatic and Capacitance
The potential gradient across the material of low permittivity is than across the material of high permittivity.

None of these
greater
smaller
both (A) and (B)

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