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NEET2016PhysicsAlternating CurrentActual

A small signal voltage V t = V 0 sin ⁡ ω t is applied across an ideal capacitor C :

Options

  1. ACurrent I(t), lags voltage V(t) by 90 o
  2. BOver a full cycle the capacitor C does not consume any energy from the voltage source
  3. CCurrent I(t) is in phase with voltage V(t).
  4. DCurrent I(t) leads voltage V(t) by 180 o

Correct answer

B. Over a full cycle the capacitor C does not consume any energy from the voltage source

Step-by-step solution

In capacitor current leads the voltage by ϕ = π 2 phase. Average power dissipated in AC circuit is given by P a v = V r m s I r m s cos ϕ In capacitor ϕ = π 2 so cos π 2 is zero.

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