A) \[2\times {{10}^{5}}A/m\]
B) \[3\times {{10}^{5}}A/m\]
C) \[4\times {{10}^{5}}A/m\]
D) \[5\times {{10}^{5}}A/m\]
Correct Answer: D
Solution :
(d) \[5\times {{10}^{5}}A/m\] Given. \[l=3\text{ }cm,\text{ }A=2\text{ }c{{m}^{2}},\text{ M}=3\text{ }A{{m}^{2}}\] Intensity of magnetisation \[=\frac{M}{lA}=\frac{3}{3\times {{10}^{-2}}\times 2\times {{10}^{-4}}}\] \[=\frac{1}{2\times {{10}^{-6}}}=0.5\times {{10}^{6}}=5\times {{10}^{5}}A/m\]
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