Q. A circular wire of radius $r$ rotates about its own axis with angular speed $\omega$ in a magnetic field $B$ perpendicular to its plane, then the induced emf is
A) $\frac{1}{2}Br\omega^{2}$
B) $Br\omega^{2}$
C) $2Br\omega^{2}$
D) Zero
Explanation
(d) The emf induces when there is change of flux. As in this case there is no change of flux, hence no emf will be induces in the wire
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.