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It is the degree to which a object is magnetized when placed in a magnetic field.
It can also be described as the pole strength per unit cross sectional area of the object or the induced dipole moment per unit volume.
As I=m/A=M/V. It is a vector value, its S.I. unit is Amp/m.
How does the (i) pole strength and (ii) magnetic moment of each part of a bar magnet change if it is cut into two equivalent pieces transverse to its length?
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