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A circuit when connected to an AC source of 12 V gives a current of 0.2 A. The same circuit when connected to a DC source of 12 V, gives a current of 0.4 A. The circuit is:

1. Series LCR
2. Series LR
3. Series RC
4. Series LC

Correct answer: Series LR

Solution

The AC current is less than the DC current, indicating the presence of inductive reactance (XL) in the circuit, which opposes AC but not DC. This suggests the circuit is a series LR circuit.

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