Single Choice

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 _____

A$$\overrightarrow { m } ,p/2$$
B$$\cfrac { \overrightarrow { m } }{ 2 } ,p/2$$
C$$\cfrac { \overrightarrow { m } }{ 2 } ,p$$
Correct Answer
D$$\overrightarrow { m } ,p$$

Solution

On cutting a bar magnets in two pieces in this manner (i.e cutting perpendicular to its length), pole strength doesn't change.
New pole strength $$=P$$
New magnetic moment$$=\cfrac{l}{2}=\cfrac{\overrightarrow{m}}{2}$$
[In the question, symbol (standard symbol) used for magnetic pole strength and moment are exchanged and answer is given according to standard symbol]

SIMILAR QUESTIONS

Magnetism

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:

Magnetism

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 :

Magnetism

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:

Contact Details