Q. The magnetic induction field strength due to a short bar magnet at a distance 0.20 m on the equatoria line is $20 \times 1 0^{- 6}$ tesla. The magnetic momentof the bar magnet is

2597 219 Moving Charges and Magnetism Report Error

A

$3.2 A m^{2}$

16%

B

$6.4 A m^{2}$

30%

C

$1.6 A m^{2}$

31%

D

$16 A m^{2}$

22%

Solution:

$B = \frac{μ _{0}}{4 π} \frac{M}{d ^{3}}$