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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.

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

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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

coulomb
milli-coulomb
micro-coulomb
pico-coulomb

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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

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

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Electrostatic and Capacitance
The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by

C/R
R/C
1/RC
RC

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Electrostatic and Capacitance
When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will

None of the listed here
Increase
Decrease
Remains same

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Electrostatic and Capacitance
What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it ?

It will melt
It will become magnetic
Its molecular structure will get changed
It will get punctured or cracked

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