The operating coil of a relay of inductance 8mH and a resistance of 30 ohms in connected to an A.C. source of 5volts 800 cps. Find the current through the coil, and the phase angle of the current relative to the applied voltage. How could this phase angle be reduced to zero without altering the value of the current passing through the coil when the relay is operated from the same A.C. supply?
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Sol. Given: 
Inductive reactance
Impedance
Current
Phase angle
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