The magnetic induction due to an infinitely long straight wire carrying a current i at a distance r from wire is given by [MP PET 1994]

\[|B|\,=\left( \frac{{{\mu }_{0}}}{4\pi } \right)\frac{r}{2i}\]

\[|B|\,=\left( \frac{{{\mu }_{0}}}{4\pi } \right)\frac{2i}{r}\]

\[|B|\,=\left( \frac{4\pi }{{{\mu }_{0}}} \right)\frac{2i}{r}\]

\[|B|\,=\left( \frac{4\pi }{{{\mu }_{0}}} \right)\frac{r}{2i}\]

The magnetic induction due to an infinitely long straight wire carryin

1.	The magnetic induction due to an infinitely long straight wire carrying a current i at a distance r from wire is given by [MP PET 1994]
A.	\[\|B\|\,=\left( \frac{{{\mu }_{0}}}{4\pi } \right)\frac{2i}{r}\]
B.	\[\|B\|\,=\left( \frac{{{\mu }_{0}}}{4\pi } \right)\frac{r}{2i}\]
C.	\[\|B\|\,=\left( \frac{4\pi }{{{\mu }_{0}}} \right)\frac{2i}{r}\]
D.	\[\|B\|\,=\left( \frac{4\pi }{{{\mu }_{0}}} \right)\frac{r}{2i}\]
Answer» B. \[\|B\|\,=\left( \frac{{{\mu }_{0}}}{4\pi } \right)\frac{r}{2i}\]