A) 3.0
B) \[3\times {{10}^{-6}}\]
C) \[8.3\times {{10}^{6}}\]
D) \[1.2\times {{10}^{-7}}\]
Correct Answer: A
Solution :
Intensity of magnetisation, \[I=\frac{M}{V}=\frac{M}{mass/density}\] Given, mass \[=1\,g={{10}^{-3}}kg\] and density \[=5\,g/c{{m}^{3}}\] \[=\frac{5\times {{10}^{-3}}kg}{{{({{10}^{-2}})}^{3}}{{m}^{3}}}\] \[=5\times {{10}^{3}}kg/{{m}^{3}}\] Hence, \[I=\frac{6\times {{10}^{-7}}\times 5\times {{10}^{3}}}{{{10}^{-3}}}\] = 3 A/m
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