A variable condenser is permanently connected to a $100$ $V$ battery. If the capacity is changed from $2\,\mu \,F$ to $10\,\mu \,F$, then change in energy is equal to
A variable condenser is permanently connected to a $100$ $V$ battery. If the capacity is changed from $2\,\mu \,F$ to $10\,\mu \,F$, then change in energy is equal to
- A
$2 \times {10^{ - 2}}\,J$
- B
$2.5 \times {10^{ - 2}}\,J$
- C
$3.5 \times {10^{ - 2}}\,J$
- D
$4 \times {10^{ - 2}}\,J$
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