Work done in placing a charge of 8- 10 -18 C on a condenser of capacitor 100 microfarad-

Two equal and opposite charges of $4 \times 10^{- 8} C$ when placed $2 \times 10^{- 2} c m$ away, form a dipole. If this dipole is placed in an external electric field of $4 \times 10^{8}$ newton/coulomb, the value of maximum torque and the work done in rotating it through $180^{o}$ will be

The amount of work done in moving a unit positive charge through distance of 10 cm on an equipotential surface is

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Work done in placing a charge of 8×10−18C on a condenser of capacitor 100 microfarad.

The correct option is A 32×10−32JWork done, W=q22C=(8×10−18)22×100×10−6=32×10−32J

Work done in placing a charge of $8 \times 10^{- 18} C$ on a condenser of capacitor $100$ microfarad.

The correct option is A $32 \times 10^{- 32} J$
Work done, $W = \frac{q^{2}}{2 C}$
$= \frac{{(8 \times 10^{- 18})}^{2}}{2 \times 100 \times 10^{- 6}}$
$= 32 \times 10^{- 32} J$