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In a series ac circuit

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maximum power is consumed when the circuit contains an ideal resistance only

power consumption is zero when the circuit contains an ideal inductor only

power consumption is zero when when the circuit contains an ideal resistance only

power consumption is maximum when the circuit contains an ideal inductor only

answer is A, C.

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Detailed Solution

$power factor = cosϕ$ and average power consumed = vI cos $ϕ$

In an ac circuit, the power factor is unity when the circuit contains an ideal resistance only $(∵ ϕ = 0)$

In an ac circuit, the power factor is zero when the circuit contains an ideal inductance or capacitance only $(∵ ϕ = 90)$

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