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Q.

A coil having n turns and resistance RΩ  is connected with a galvanometer of resistance  4RΩ. This combination is moved in time t seconds from a magnetic field W1 weber to W2 weber. The induced current in the circuit is

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a

−W2−W15Rnt

b

−nW2−W15Rt

c

−W2−W1Rnt

d

−nW2−W1Rt

answer is B.

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Detailed Solution

i=eR=−NRϕ2−ϕ1Δt=−nW2−W15Rt
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A coil having n turns and resistance RΩ  is connected with a galvanometer of resistance  4RΩ. This combination is moved in time t seconds from a magnetic field W1 weber to W2 weber. The induced current in the circuit is