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MHT CET202015 Oct 2020Morning ShiftPhysicsCapacitanceActual

A capacitor of unknown capacitance C is connected across a battery of V volt. The charge stored in it becomes Q coulomb. When potential across the capacitor is reduced by V ^ volt, the charge stored in it becomes Q'coulomb. The capacitance C is

Options

  1. AQ - Q ^ V ^
  2. BV ^ Q - Q ^
  3. CQ + Q ^ V ^
  4. DQ - Q ^ V ^

Correct answer

D. Q - Q ^ V ^

Step-by-step solution

Q = CV Q ^ = C ( V - V ^ )= CV = CV ^ Q ^ = Q - CV ^ CV ^ = Q - Q ^ C = Q-Q^ V^

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