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MHT CET Physics question

PhysicsAlternating CurrentMHT CET

An arc lamp requires a direct current of 10 A at 80 V to function. If it is connected to a 220 V (rms), 50 Hz AC supply, the series inductor needed for it to work is close to

Answer: (D)

Solution

Lamp resistance ; at 10 A on 220 V, , so $===20.5\

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Question ID VK-082375