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Question

An inductor and a resistor are connected in series with an AC source. In this circuit
  1. current and potential difference across the resistor lead the potential difference across the inductor.
  2. current and potential difference across the resistor lag behind the potential difference across the inductor by an angle π2.
  3. current and potential difference across the resistor lag behind the potential difference across the inductor by an angle π
  4. potential difference across the resistor lags behind the potential difference across the inductor by an angle π2 but the current in the resistor leads the potential difference across the inductor by an angle π2.


Solution

The correct option is B current and potential difference across the resistor lag behind the potential difference across the inductor by an angle π2.
The L-R Series cuicuit be thisThe phasor diagram for this circuit is 
Therfore option b is correct.

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