If the charge on a capacitor is increased by $2C$, the energy stored in it increases by $44 \%$. The original charge on the capacitor is (in $C$ )
JEE MAIN 2022, Medium
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$U \propto q ^{2}$
$\Rightarrow q _{ f }=1.2 \,q$
$q _{ f }- q =2$
$\Rightarrow 1.2 \,q - q =2$
$q =10$
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