(d) Instantaneous current in a capacitive circuit is given by,

Which means the current leads the voltage by phase angle ϕ. I_{m} is not given, therefore, we calculate it from the formula, I_{m} = I_{rms}/0.707. Put the value of effective current calculated in (b), we have, Im = 2/0.707 = 2.828 A. Similarly, ω = 2πf. Put the value of frequency, ω = 2× 3.14× 50 = 314 rad/s. Put all these values in the above equation, we have

This is the required equation.

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