Q. The magnetic field due to a small magnetic dipole of magnetic moment $M$, at distance $r$ from the centre on the equatorial line is given by (in M.K.S system)
A) $\frac{\mu_{0}}{4\pi} \times \frac{M}{r^{2}}$
B) $\frac{\mu_{0}}{4\pi} \times \frac{M}{r^{3}}$
C) $\frac{\mu_{0}}{4\pi} \times \frac{2M}{r^{2}}$
D) $\frac{\mu_{0}}{4\pi} \times \frac{2M}{r^{3}}$
Explanation
(b) $B_{equatorial} = \frac{\mu_{0}}{4\pi}\frac{M}{r^{3}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.