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MHT CET20228 Aug 2022Evening ShiftPhysicsCapacitanceActual

If the charge on the capacitor is increased by 2 coulombs, the energy stored in it increase by 21 % . the original charge on the capacitor is

Options

  1. A10 C
  2. B15 C
  3. C20 C
  4. D5 C

Correct answer

C. 20 C

Step-by-step solution

Concept: energy stored in capacitor is given by U= q^2 2 c Where, q is charge and c is capacitance. Now, if change is increased by , the energy stored is U_n= (q+ )^2 2 c Given, =2 C , U_n=1.21 U aligned & 1.21 ( q^2 2 c )= (q+ )^2 2 c & ( q+ q^2 )^2=1.21 & ( q+ q )=1.1 & q =0.1 aligned q= 0.1 =20 C

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