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A short bar magnet placed with its axis ...

A short bar magnet placed with its axis at` 30^(@)` with an external field of 800 G experiences a torque of 0.016 Nm.
(a)What is the magnetic moment of the magnet ?

Text Solution

Verified by Experts

The most stable position is ` theta = 0^(@)` and most unstable position is ` theta = 180^(@)`. Work done is given by
`W=U_m( theta = 180^(@))-U_m(theta = 0^(@))`
`=2mB=2 xx 0.40 xx 800 xx 10^(-4) = 0.064 J `
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