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Q.

An inductor coil joined to a 6V battery draws a steady current of 12A. This coil is connected to a capacitor and an AC source of rms voltage 6V in series. If the current in the circuit is in phase with the emf, the rms current is

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a

12A

b

24A

c

20A

d

8A

answer is A.

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Detailed Solution

 Resistance of coil =VDClDC=0.5Ω

Current is in phase with emf that means net impedance is equal to zero there fore same current flows through it.

Thus, impedance, Z=R=0.5Ω

So, Irms=VrmsZ=60.5=12A

 

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