A) \[\frac{1}{{{r}^{2}}}\]
B) \[\frac{1}{r}\]
C) \[\frac{1}{{{r}^{3}}}\]
D) \[\frac{1}{\sqrt{r}}\]
Correct Answer: B
Solution :
: Magnetic field due to an infinitely long straight conductor carrying steady current at a distance r from it is given by \[B=\frac{{{\mu }_{0}}2I}{4\pi r}\] or \[B\propto \frac{1}{r}\]
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