$A$ coil having $n$ turns and resistance $R$ is connected with a galvanometer of resistance $2R$. This combination is moved in time $t$ from flux $\phi_1$ to $\phi_2 \ Wb$. The induced current in the circuit is
- A$\frac{n(\phi_1 - \phi_2)}{Rt}$
- B$\frac{n(\phi_2 - \phi_1)}{Rt}$
- C$\frac{n(\phi_2 - \phi_1)}{3Rt}$
- D$\frac{n(\phi_2 - \phi_1)}{2Rt}$
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