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
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