The magnetic moment of magnet of mass 75gm is 9×10−7Am2. If the density of the material of magnet is 7.5×103kg m−3 then the intensity of magnetisation will be
A
90A/m
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B
9A/m
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C
0.09A/m
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D
0.9A/m
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Solution
The correct option is C0.09A/m Magnetisation, I=MV=M(md)=Mdm