The total emf induced in a closely wound coil of $N$ turns in which the magnetic flux linked with the coil is changing at the rate $\frac{d \phi_{B}}{dt}$ is
- A$-N \frac{d \phi_{B}}{dt}$
- B$N \frac{d \phi_{B}}{dt}$
- C$-N \frac{d^2 \phi_{B}}{dt^2}$
- D$-\frac{d \phi_{B}}{dt}$
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