A) \[{{\text{n}}^{-3}}\]
B) \[{{\text{n}}^{-2}}\]
C) \[{{\text{n}}^{-4}}\]
D) \[{{\text{n}}^{-5}}\]
Correct Answer: B
Solution :
\[B=\frac{{{\mu }_{0}}I}{2r}\] \[=\frac{{{\mu }_{0}}qt}{2r}\] \[r\propto {{n}^{2}}\] \[B\propto {{m}^{-2}}\]
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