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Electrostatic and Capacitance

Electrostatic and Capacitance
The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to ______ percent of its value.

37, initial
62, final
62, initial
37, final

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Electrostatic and Capacitance
If a third equal and similar charge is placed between two equal and similar charges, then this third charge will

be in unstable equilibrium
move out of the field of influence of the two charges
remain in stable equilibrium
not be in equilibrium

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

48 µs
480 µs
24 µs
2.42 µs

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Electrostatic and Capacitance
The minimum value of potential gradient in a cable occurs in

outer sheath
insulation
uniformly all over
conductor

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Electrostatic and Capacitance
For making a capacitor, it is better to select a dielectric having

Permittivity same as that of air
Low permeability
High permeability
Permittivity slightly more than that of air

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Electrostatic and Capacitance
A 0.01 µF capacitor equals how many picofarads?

100,000 pF
10,000 pF
1,000 pF
100 pF

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