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  4. If the charge on a capacitor is increased by 2 C, the energy stored in it increases by 44 %. The original charge on the capacitor is (in C ) :

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Q. If the charge on a capacitor is increased by $2 C$, the energy stored in it increases by $44 \%$. The original charge on the capacitor is (in $C$ ) :

JEE MainJEE Main 2022Electrostatic Potential and Capacitance

Solution:

$U \propto q ^{2}$
$\Rightarrow q _{ f }=1.2 q$
$q _{ f }- q =2$
$\Rightarrow 1.2 q - q =2$
$q =10$