Question 242: Electromagnetic Induction

Question

A metal rod of length ' $l$ ' rotates about one of its ends in a plane perpendicular to a magnetic field of induction ' $B$ '. If the e.m.f. induced between the ends of the rod is ' $e$ ', then the number of revolutions made by the rod per second is

Accepted Answer

A conducting rod of length ' $l$ ' whose one end is fixed, is rotated about the axis passing through its fixed end and perpendicular to its length with constant angular velocity $\omega$.
$$\begin{aligned}
\mathrm{e} & =\mathrm{B} \pi l^2 \mathrm{n} \
	herefore \quad \mathrm{n} & =\frac{\mathrm{e}}{\pi \mathrm{~B} l^2}
\end{aligned}$$

Answer

$\frac{\mathrm{e}}{\mathrm{B} \pi^2 l}$

Answer

$\frac{\mathrm{e}}{\mathrm{B} \pi l^2}$

Answer

$\frac{\mathrm{B}^2}{\mathrm{e} \pi l}$

Answer

$\frac{\pi l^2}{\mathrm{eB}}$

Electromagnetic Induction

A metal rod of length ' l ' rotates about one of its ends in a plane perpendicular to a magnetic field of induction ' B '. If the e.m.f. induced between the ends of the rod is ' e ', then the number of revolutions made by the rod per second is

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