# A copper disc of radius 1 m is rotated about its natural axis with an angular velocity 2 rad/sec in a uniform magnetic field…

Q: A copper disc of radius 1 m is rotated about its natural axis with an angular velocity 2 rad/sec in a uniform magnetic field of 5 Telsa with its plane perpendicular to the field. Find the emf induced between the centre of the disc and its rim.

Sol: $\large e = \frac{1}{2} B \omega r^2$

$\large e = \frac{1}{2} \times 5 \times 2 \times (1)^2$

e = 5 volt