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