A) \[9.25V\]
B) \[{{I}_{0}}\]
C) \[4{{l}_{0}}\]
D) \[3{{l}_{0}}\]
Correct Answer: B
Solution :
As we know that magnetic permeability of iron \[\mu ={{\mu }_{0}}(1+\chi )=4\pi \times {{10}^{-7}}(1+499)\] \[=4\pi \times .500\times {{10}^{-7}}Tm{{A}^{-1}}\] \[B=\mu H=4\pi \times 500\times {{10}^{-7}}\times 1600T\] \[\therefore \]Magnetic flux \[\phi =BA=4\pi \times 5\times 16\times {{10}^{-3}}\times 0.4\times {{10}^{-4}}\] \[=320\times (0.40)\times \pi \times {{10}^{-7}}\] \[=4.2\times {{10}^{-5}}Wb\]
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