Question 255: Electromagnetic Induction

Question

The coil and magnet are moved in the same direction with same speed (V). The induced e.m.f. is

Accepted Answer

$$\mathrm{e}=-\mathrm{N} \frac{\mathrm{~d} \phi}{\mathrm{dt}}$$
As the coil and magnet are moving in same direction in same speed,
$$\begin{array}{ll}
	herefore & \phi=\mathrm{B} \cdot \mathrm{~A}=\mathrm{constant} \
	herefore & \frac{\mathrm{~d} \phi}{\mathrm{dt}}=0
\end{array}$$
Thus, the emf induced is zero because the relative speed of magnet with respect to coil is zero.

Answer

zero.

Answer

proportional to V.

Answer

proportional to $\mathrm{V}^{-1}$.

Answer

finite but does not depend on V.

Electromagnetic Induction

The coil and magnet are moved in the same direction with same speed (V). The induced e.m.f. is

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