Question 315: Magnetism and Matter

Question

Two short magnetic dipoles m
1
and m
2
each having magnetic moment of 1 Am
2
are placed at point O and P respectively. The distance between OP is 1 meter. The torque experienced by the magnetic dipole m
2
due to the presence of m
1
is ........... $	imes$ 10
$-$7
Nm.
![](https://imagex.cdn.examgoal.net/1ktcfcp1g/52056214-fd0b-44c2-b745-f07419d4c66a/8c16a840-1125-11ec-9890-e1f55a1f69a0/file-1ktcfcp1h.jpeg)

Accepted Answer

$\overrightarrow 	au   = \overrightarrow {{M_2}}  	imes \overrightarrow {{B_1}} $
$	au  = {M_2}{B_1}\sin 90^\circ $
$ = 1 	imes {{{\mu _0}} \over {4\pi }}{{{M_1}} \over {{{(1)}^3}}}1$
= 10
$-$7
N.m

Magnetism and Matter

Two short magnetic dipoles m 1 and m 2 each having magnetic moment of 1 Am 2 are placed at point O and P respectively. The distance between OP is 1 meter. The torque experienced by the magnetic dipole m 2 due to the presence of m 1 is ........... \times 10 -7 Nm.

Integer / Numeric Answer Type