Q. Two magnets have the same length and the same pole strength. But one of the magnets has a small hole at its center. Then
A) Both the equal magnetic moment
B) One with hole has smaller magnetic moment
C) One with hole has large magnetic moment
D) One with hole has loses magnetism through the hole
Explanation
(b) Hole reduces the effective length of the magnet and hence magnetic moment reduces.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.