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  • An iron rod of length land magnetic moment M is bent in the form of the semicircle. Now its magnetic moment will be:Option: 1 M<div cla

An iron rod of length land magnetic moment M is bent in the form of the semicircle. Now its magnetic moment will be:

Option: 1

M


Option: 2

\frac{2M}{\pi }


Option: 3

\frac{M}{\pi }


Option: 4

M\pi


Answers (1)

best_answer

 

As we learn

Magnetic moment or magnetic dipole moment -

\vec{M}=m\times2\vec{l}

- wherein

It is a vector quantity directed from south to north.

 

 On bending a rod it's pole strength remains unchanged whereas its magnetic moment changes.

New magnetic moment M' = m (2R) =   m \times \left (\frac{2L}{\pi} \right )  =\frac{2M}{\pi}

 

Posted by

Ajit Kumar Dubey

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