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Q.

A coil having n turns and resistance R Ω is connected with a galvanometer of resistance 4R Ω. 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

Induced current = eR=1R-∆ϕ∆t                          =-15RnW2-nW1t =-nW2-W15Rt
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