If charge on a capacitor is increased by 2C , energy stored in it increases by 44 % . original charg

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2. Electric Potential and Capacitance

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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 $C$ )

A

$10$

B

$20$

C

$30$

D

$40$

(JEE MAIN-2022)

Solution

$U \propto q ^{2}$

$\Rightarrow q _{ f }=1.2 \,q$

$q _{ f }- q =2$

$\Rightarrow 1.2 \,q – q =2$

$q =10$

Standard 12

Physics

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