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MHT CET 2023 (12 May, Shift 2) · Energy Stored & Force between Plates

Energy Stored & Force between Plates question from MHT CET 2023 (12 May, Shift 2)

Q16MHT CET 2023 · 12 MAY · SHIFT 2Medium

Energy Stored & Force between Plates

If the charge on the capacitor is increased by 3 coulombs, the energy stored in it increases by $44\%$ . The original charge on the capacitor is

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Answer: (b)

$U \propto q^2$ , so $\frac{(q+3)^2}{q^2} = 1.44$ .
$\frac{q+3}{q} = 1.2 \Rightarrow 0.2q = 3$
$q = 15\text{ C}$
So the answer is (b) 15 C.

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