Q.
The magnet in figure rotates a shown on a pivot through its center. At the instant shown, what are the directions of the induced currents.
A) $A\ to\ B\ and\ C\ to\ D$
B) $B\ to\ A\ and\ C\ to\ D$
C) $A\ to\ B\ and\ D\ to\ C$
D) $B\ to\ A\ and\ D\ to\ C$
Explanation
(a) In the rotation of magnet, $N$ pole moves closer to coil $CD\ and\ S\ $ pole moves closer to coil $AB$. As per Lenz’s law, $N$ pole should develop at the end corresponding to $C$. Induced current flows from $C\ to\ D.\ \ Again\ S\ $pole should develop at the end corresponding to $B$. Therefore, induced current in the coil flows from $A\ \ to\ B.$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.