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Q.

A bar magnet made of steel has a magnetic moment of 1.2 Am2 and a mass of 4.0×10−3kg . If the density of steel is  12.0×103kg/m3. The intensity of magnetization of the magnet is  __×106Am-1

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answer is 3.6.

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Detailed Solution

The volume of the bar magnet  V=massdensity=4×10−312×103=13×10−6m3The intensity of magnetization is∴I=MV=1.2Am213×10−6m3=1.2×3×106A/m=3.6×106 ⇒I=3.6×106A/m−1
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