A) \[\frac{m}{{{r}^{2}}}\]
B) \[m{{r}^{2}}\]
C) \[\frac{{{r}^{2}}}{m}\]
D) \[\frac{m}{r}\]
Correct Answer: A
Solution :
The magnetic field \[(\vec{B})\] due /to an isolated pole at a distance r from it is given by \[B=\frac{{{\mu }_{0}}}{4\pi }.\frac{m}{{{r}^{2}}}\] where m is pole strength.
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