A magnetised wire of moment M is bent to form an arc. The arc subtends an angle of $$60^0$$ at the centre of curvature. The new magnetic moment of the wire is:
New magnetic moment,
$$M'=M \times \dfrac{2 sin(\theta/2)}{\theta}= M \times \dfrac{2\times (1/2)}{\pi /3} = \dfrac{3M}{\pi}$$
A bar magnet of length $$l$$, pole strength $$p$$ and magnetic moment $$'\overset{\rightarrow}m '$$ is split $$l/2$$ into two equal pieces each of length. The magnetic moment and pole strength of each piece is respectively _______ and _____
Two magnets of moments $$8$$ and $$125$$ units are placed so as to have a common axial line and like poles faing each other. Then the distances of the centres of the magnets from the null point will be :
A magnetised wire of moment M is bent to form an arc. The arc subtends an angle of $$60^0$$ at the centre of curvature. The new magnetic moment of the wire is: