A parallel plate capacitor is charged and the charging battery is then disconnected. If the plates of the capacitor are moved farther apart by means of insulating handles:

Options

A. the charge on the capacitor increases
B. the voltage across the plates decreases
C. the capacitance increases
D. the electrostatic energy stored in the capacitor increases

Answer

D

Explanation

When the battery is diconnected, the charge will remain same in any case.
Capacitance of a parallel plate capacitor is given by
`C = (epsilon_(0)A)/(d)`
When `d` is increased, capacitance will decreases and because the charge remains the same, so according to `q = CV` the voltage will increase, Hence the electrostatics energy stored in the capacitor will increase.