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Q.

An alternating e.m.f. of 200 V and 50 cycles is connected to a circuit of resistance 3.142Ω and inductance 0.01 H. The lag in time between the e.m.f. and the current is

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a

1.5 ms

b

2.5 ms

c

3.5 ms

d

None of these

answer is B.

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Detailed Solution

tanθ=XLR=1     ∴θ=450t=θ×Time period 360
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