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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) $-\frac{{W}_{2}-{W}_{1}}{5\text{\hspace{0.17em}}Rnt}$

(2) $-\frac{n\left({W}_{2}-{W}_{1}\right)}{5\text{\hspace{0.17em}}Rt}$

(3) $-\frac{\left({W}_{2}-{W}_{1}\right)}{Rnt}$

(4) $-\frac{n\left({W}_{2}-{W}_{1}\right)}{Rt}$