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MHT CET 2025 (21 Apr, Shift 2) · Energy Stored & Force between Plates

Energy Stored & Force between Plates question from MHT CET 2025 (21 Apr, Shift 2)

Q8MHT CET 2025 · 21 APR · SHIFT 2Medium

Energy Stored & Force between Plates

If the charge on the capacitor is increased by 3C, the energy stored in it increases by 21%21\%. The original charge on the capacitor is

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Answer: (c)

  1. U=q22C⇒U∝q2U = \frac{q^2}{2C} \Rightarrow U \propto q^2.
  2. (q+3)2q2=1.21⇒q+3q=1.1\frac{(q+3)^2}{q^2} = 1.21 \Rightarrow \frac{q+3}{q} = 1.1
  3. 0.1q=3⇒q=30 C0.1q = 3 \Rightarrow q = 30\text{ C}
  4. So the answer is (c) 30 C.
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