A) \[\frac{{{10}^{-7}}}{{{\mu }_{0}}}\]
B) \[{{10}^{-17}}{{\mu }_{0}}\]
C) \[{{10}^{-6}}{{\mu }_{0}}\]
D) \[{{10}^{-7}}{{\mu }_{0}}\]
Correct Answer: B
Solution :
\[i=\frac{q}{t}=100\times e\] \[{{B}_{\text{centre}}}=\frac{{{\mu }_{o}}}{4\pi }.\frac{2\pi i}{r}=\frac{{{\mu }_{o}}}{4\pi }.\frac{2\pi \times 100e}{r}\] \[=\frac{{{\mu }_{o}}\times 200\times 1.6\times {{10}^{-19}}}{4\times 0.8}={{10}^{-17}}{{\mu }_{o}}\]
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