Question

If a bar magnet is cut in half what happens to its dipole moent

Answer 1

There is a relation between magnetic pole strength,magnetic length, current and area of cross-section of a magnet.

m*l=I*A=M

where M=Magnetic moment.

According to this relation, when a bar magnet is cut into two halves along its length, area of cross-section become half.

But length remains the same.

So, the pole strength actually becomes half and consequently the magnetic moment becomes half

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