Q. The magnitude of the earth’s magnetic field at a place is $B_{0}$ and the angle of dip is $\delta.$ A horizontal conductor of length $l,$ lying north-south, moves eastwards with a velocity $v$. The emf induced across the rod is
A) Zero
B) $B_{0}lv$
C) $B_{0}lv\sin\ \delta$
D) $B_{0}lv\cos{\ \delta}$
Explanation
(c) Horizontal conductor intercepts vertical component $= B_{0}\sin\delta$
$\therefore\ e = \left( B_{0}\sin\delta \right)lv$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.