Question

Magnetic intensity for an axial point due to a short bar magnet of magnetic moment $M$ is given by

• A. $\frac{\mu_{0}}{4 \pi} \times \frac{M}{d^{3}}$
• B. $\frac{\mu_{0}}{4 \pi} \times \frac{M}{d^{2}}$
• C. $\frac{\mu_{0}}{2 \pi} \times \frac{M}{d^{3}}$
• D. $\frac{\mu_{0}}{2 \pi} \times \frac{M}{d^{2}}$

Answer 1

Answer: (C)

$B_{a}=\frac{\mu_{0}}{4 \pi} \frac{2 M}{d^{3}}=\frac{\mu_{0}}{2 \pi} \frac{M}{d^{3}}$