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Assertion :An inductance and a resistance are connected in series with an AC circuit. In this circuit, the current and the potential difference across the resistance lags behind potential difference across the inductance by an angle $$\dfrac{\pi}{2}$$. Reason: In $$L-R$$ circuit, voltage leads the current by phase angle which depends on the value of inductance and resistance both.


A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
When capacitors or inductors are involved in an AC circuit, the current and voltage do not peak at the same time. The fraction of a period difference between the peaks expressed in degrees is said to be the phase difference. The phase difference is <= 90 degrees. It is customary to use the angle by which the voltage leads the current. This leads to a positive phase for inductive circuits since current lags the voltage in an inductive circuit. The phase is negative for a capacitive circuit since the current leads the voltage.
Since impedance of the circuit is dependent on L and R so phase difference will also be depending on it.

Physics

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