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  4. A bar magnet is cut into two equal halves by a plane parallel to the magnetic axis of the following physical quantities the one which remains unchanged is

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Q. A bar magnet is cut into two equal halves by a plane parallel to the magnetic axis of the following physical quantities the one which remains unchanged is

Moving Charges and Magnetism

Solution:

For each half pole strength $m$ becomes half
$M=m\times 2l$ becomes half and volume $V=a\times 2l$ also becomes half therefore, magnetic intensity remains constant.