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The instantaneous value of emf and curre...

The instantaneous value of emf and current in an A.C. circuit are; E=1.414sin(100πt− 4 π ​ ) , I=0.707sin(100πt) . The impedance of the circuit will be

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No, it is not true for rms voltage because the potential differences across various parts of the circuit may not be in the same phase.
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CHHAYA PUBLICATION-ALTERNATING CURRENT -NCERT TEXTBOOK QUESTIONS WITH ANSWER HINT
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