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A bar magnet of magnetic moment 10 Am^ 2...

A bar magnet of magnetic moment `10 Am^ 2` has a cross sectional area of `2.5 xx1O^-4 m^2`.If the intensity rof magnetisation of the magnet is `10^6 Am^-1`, the length of the magnet is

A

0.4 m

B

0.04 cm

C

0.04 m

D

50 cm

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