A) \[2.5\times {{10}^{3}}A{{m}^{-1}}\]
B) \[3\times {{10}^{5}}A{{m}^{-1}}\]
C) \[2.0\times {{10}^{3}}A{{m}^{-1}}\]
D) \[2.0\times {{10}^{5}}A{{m}^{-1}}\]
Correct Answer: B
Solution :
(b) \[3\times {{10}^{5}}A{{m}^{-1}}\] Here, \[n=500\text{ }turns/m\] \[l=1.2\,A,\,\,\,\,{{\mu }_{r}}=500\] Magnetic intensity, \[H=nl=500\,{{m}^{-1}}\times 1.2\,A=600\,A{{m}^{-1}}\] As \[{{\mu }_{r}}=1+\chi \] Where \[\chi \] is the magnetic susceptibility of the material or \[\chi =({{\mu }_{r}}-1)\] Magnetisation, \[M=\chi H\] \[=({{\mu }_{r}}-1)H=(500-1)\times 600\,A{{m}^{-1}}\] \[=499\times 600\,A{{m}^{-1}}\] \[=2.994\times {{10}^{5}}\,A{{m}^{-1}}\] \[\approx 3\times {{10}^{5}}A{{m}^{-1}}\]
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