A) 4 ´ 10?5 Wb/m2
B) 9 ´ 10?5 Wb/m2
C) 8 ´ 10?5 Wb/m2
D) 6 ´ 10?5 Wb/m2
Correct Answer: A
Solution :
\[B=\frac{{{\mu }_{0}}}{4\pi }.\frac{2i}{r}={{10}^{-7}}\times \frac{2\times 20}{10\times {{10}^{-2}}}=4\times {{10}^{-5}}Wb/{{m}^{2}}\]
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