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Q.

In the circuit shown below, R is pure resistor, L is an inductor of negligible resistance (as compared to R), S is a 100 V, 50 Hz AC source of negligible resistance. With key K1 alone or K2 alone closed, the current is I0. If the source is changed to 100 V 150 Hz the current with K1 alone closed and with K2 alone closed will be respectively

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a

I0, I03

b

I0, 3I0

c

3I0, I0

d

3I0, I03

answer is A.

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Detailed Solution

With the change in frequency, . resistance R remains unchanged but reactance XLbecomes three times.

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