# Q 7.13 (b) A coil of inductance and resistance  is connected to a ,   ac supply. What is the time lag between the voltage maximum and the current maximum?

Let the voltage  in the circuit be

and

Current in the circuit be

Where  is the phase difference between voltage and current.

V is maximum At

t = 0

is maximum At

Hence, the time lag between voltage maximum and the current maximum is

.

For phase difference   we have

Hence time lag between the maximum voltage and the maximum current is

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