NEET 2015 Physics question
A resistance '' draws power '' when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes '', the power drawn will be:
Answer: (4)
Solution
With only the resistance, ( = rms voltage of the source), so . With the inductor in series, the rms current is and the power factor is (from the impedance triangle). New power \cos$φ =
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