Q.
If a bar magnet of length l and cross-sectional area A is cut into two equal parts as shown in figure, then the pole strength of each pole becomes
A) Half
B) Double
C) One-fourth
D) Four time
Explanation
(a) Pole strength depends on material of magnet, state of magnetization and cross-sectional area. As $m \propto A,$ so if A becomes half, pole strength gets half.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.