Electrostatics… | NUST Entrance Test Physics

Energy required to charge a capacitor of \rm{5 \,\mu F} by connecting DC source of 20 kV is

Difficulty: Easy

A:

\rm{1\, kJ}

B:

\rm{2\, kJ}

C:

\rm{5\, kJ}

D:

\rm{10\, kJ}

Capacitors store

Difficulty: Easy

A:

Equal charges

B:

Unequal charges

C:

Equal and opposite charges

D:

Unequal and opposite charges

If a $ \rm{2 \,\mu F}$ capacitor is connected, by closing a switch, to a supply of 100 volts through a $1\times10^{6}$ ohm series resistance. What will be the time constant?

Difficulty: Easy

A:

2 seconds

B:

3 seconds

C:

4 seconds

D:

7 seconds

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