A) \[{{10}^{-3}}\,\mu {{ }_{0}}\]
B) \[{{10}^{-7}}\,\mu {{ }_{0}}\]
C) \[{{10}^{-11}}\,\mu {{ }_{0}}\]
D) \[{{10}^{-17}}\,\mu {{ }_{0}}\]
Correct Answer: D
Solution :
Current due to circulating electron, \[i=\frac{q}{T}=nq\] \[=(1\,rev/\sec )\times 100\,e\] \[=100\times 1.6\times {{10}^{-19}}amp\] \[=1.6\times {{10}^{17}}amp\] \[\therefore \]Magnetic field at centre, \[B=\frac{{{\mu }_{0}}i}{2r}\] \[\frac{={{\mu }_{0}}\times 1.6\times {{10}^{-17}}}{2\times 0.8}\] \[-{{10}^{17}}{{\mu }_{0}}\] (Where \[\mu {{ }_{0}}=\] permeability of free space.)
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