Let a bar magnet makes angle θ with magnetic field B and

**be the length of the bar as show in figure.***2l*
Force on N-pole =

**along B and Force on S-pole =***mB***, opposite to B, since these are the equal and opposite forces they produce torque***mB*
ז

**= force x perpendicular distance****x***. = mB***x***NA = mB***ז***2lsinθ therefore**=MBsinθ*
The direction of the torque is perpendicular to the the plain
containing M and B, and given by right handed screw rules.

Magnetic dipole moment as the torque acting on a dipole held
perpendicular to uniform magnetic field of unit strength

SI unit of M is JT

^{-1}
Force on N-pole = mB along B and Force on S-pole = mB, opposite to B..............But why these forces are in opposite directions?

ReplyDeleteBeacuse Megnetic bar contain two pole north and south

Deletewhat is 'B'?

ReplyDeletemagnetic field

Deletewhy force becomes equal to mB ?

ReplyDeleteWhere does 2l goes in the last step?

ReplyDeleteWhere does 2l goes in the last step?

ReplyDeleteSir M=m×2L which is written correctly

Delete