A) decreases 16 times
B) increases 4 times
C) decreases 4 times
D) increases 32 times
Correct Answer: D
Solution :
[d] \[\because B=\frac{{{\mu }_{0}}I}{2r}\text{ and}\,\,\,\,\,\text{ }I=\frac{e}{T}\] \[B=\frac{{{\mu }_{0}}e}{2rT}\left[ r\propto {{n}^{2}},T\propto {{n}^{5}} \right];\] \[B\propto \frac{1}{{{n}^{5}}}\]
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