Coil of n turns and resistance R in series with another resistance moved from flux phi1 to phi2: induced current

1. A.
   $\frac{n\left( \phi_{1} - \phi_{2} \right)}{3Rt}$
2. B.
   $\frac{2n\left( \phi_{1} - \phi_{2} \right)}{3Rt}$
3. C.
   $\frac{2n\left( \phi_{1} - \phi_{2} \right)}{Rt}$
4. D.
   $\frac{n\left( \phi_{1} - \phi_{2} \right)}{Rt}$

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1. A.
   $\dfrac{n(\phi_1 - \phi_2)}{Rt}$
2. B.
   $\dfrac{n(\phi_2 - \phi_1)}{Rt}$
3. C.
   $\dfrac{n(\phi_2 - \phi_1)}{3Rt}$
4. D.
   $\dfrac{n(\phi_2 - \phi_1)}{2Rt}$

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1. A.
   $\dfrac{4n(\Phi_1 - \Phi_2)}{5RT}$
2. B.
   $\dfrac{5n^2(\Phi_1 - \Phi_2)}{4RT}$
3. C.
   $\dfrac{2n(\Phi_1 - \Phi_2)}{3RT}$
4. D.
   $\dfrac{3n(\Phi_1 - \Phi_2)}{4RT}$

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