$A$ coil of $n$ turns and resistance $R \ \Omega$ is connected in series with a resistance $R/2$. The combination is moved for time $t$ seconds through a magnetic flux change from $\phi_{1}$ to $\phi_{2}$. The induced current in the circuit is:
- A$\frac{2 n(\phi_{1}-\phi_{2})}{3 R t}$
- B$\frac{n(\phi_{1}-\phi_{2})}{3 R t}$
- C$\frac{n(\phi_{1}-\phi_{2})}{R t}$
- D$\frac{2 n(\phi_{1}-\phi_{2})}{R t}$
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