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Q.

When 100 volt DC is applied across a solenoid, a current of 1.0 amp flows in it. When 100 volt AC is applied across the same coil, the current drops to 0.5 amp. If the frequency of the AC source is 50 Hz then power factor of the circuit is

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a

0.33

b

0.25

c

0.2

d

0.5

answer is D.

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Detailed Solution

in dc only resistance will come into play R=1001=100 ohm in A.C impedance will be considered Z=1000.5=200 ohmspower factor RZ=100200=0.5
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