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  4. A rectangular coil A B C D is rotated anticlockwise with a uniform angular velocity about the axis shown in the figure. The axis of rotation of the coil as well as the magnetic field B are horizontal. The induced emf in the coil would be minimum when the plane of the coil

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Q. A rectangular coil $A B C D$ is rotated anticlockwise with a uniform angular velocity about the axis shown in the figure. The axis of rotation of the coil as well as the magnetic field $B$ are horizontal. The induced emf in the coil would be minimum when the plane of the coilPhysics Question Image

Electromagnetic Induction

Solution:

$\varepsilon=B \cdot A N \omega \sin \theta$
$\varepsilon=0$ when $\theta=0, \theta=0$
means normal to the plane of the coil and magnetic field are parallel. It means plane of coil is at right angle to the magnetic field.