Question

The induced emf in a coil rotating in a magnetic field is maximum when the angle between the plane of the coil and the direction of field is :

• A. zero
• B. $\frac{\pi}{4}$
• C. $\frac{\pi}{2}$
• D. Some angle other that those mentioned above.

Answer 1

Answer: (A)

zero

Answer 2

$E = E_o$ sin $\theta$, where $\theta$ is the angle between $\overrightarrow{B}$ and area vector $\overrightarrow{S}$ of the coil. Since $\overrightarrow{S}$ is perpendicular to the surface, therefore when the angle between plane of the coil and the magnetic field is zero, the $\theta$ = 90. Hence $E = E_o$