Q. The magnetic moment of a magnet of length $10\ cm$ and pole strength $4.0\ Am$ will be
A) 0.4 $Am^{2}$
B) 1.6 $Am^{2}$
C) 20 $Am^{2}$
D) 8.0 $Am^{2}$
Explanation
(a) $M = mL = 4 \times 10 \times 10^{- 2} = 0.4\ A \times m^{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.