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Q.

A 20 volts AC is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is

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a

16 volts

b

10 volts

c

8 volts

d

6 volts

answer is A.

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Detailed Solution

The voltage across a L-R combination is given byV2=VR2+VL2VL=V2−VR2=400−144=256=16 volt
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A 20 volts AC is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is