Q. Two small bar magnets are placed in a line with like poles facing each other at a certain distance $d$ apart. If the length of each magnet is negligible as compared to $d$, the force between them will be inversely proportional to
A) $d$
B) $d^{2}$
C) $\frac{1}{d^{2}}$
D) $d^{4}$
Explanation
(d) $F = \frac{\mu_{0}}{4\pi}\left( \frac{6MM^{'}}{d^{4}} \right)$ in end-on position
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.