Question

Which of the following graphs represent the variation of magnetic field $\left(B\right)$ with distance $\left(R\right)$ from an infinitely long straight conductor?

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

We know that, the magnetic field due to an infinitely long straight current carrying conductor at a distance of $R$ is given by,

$B=\frac{{\mu }_{o}I}{2\pi R}$

For same current,
$B\propto \frac{1}{R}$

The required graph for the above relation is,