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

(1) W2W15Rnt

(2) n(W2W1)5Rt

(3) (W2W1)Rnt

(4) n(W2W1)Rt