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MHT CET 2021 (22 Sep, Shift 1) · Energy Stored & Force between Plates

Energy Stored & Force between Plates question from MHT CET 2021 (22 Sep, Shift 1)

Q27MHT CET 2021 · 22 SEP · SHIFT 1Medium

Energy Stored & Force between Plates

If the charge on the capacitor is increased by 2 C the energy stored in it increased by 21%. Total original charge on the capacitor is

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Answer: (c)

  1. U∝q2U \propto q^2, so (q+2)2q2=1.21\frac{(q+2)^2}{q^2} = 1.21.
  2. q+2q=1.1⇒0.1q=2\frac{q+2}{q} = 1.1 \Rightarrow 0.1q = 2
  3. q=20 Cq = 20\text{ C}
  4. So the answer is (c) 20 C.
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