Question

Draw a graph for a thin current carrying hollow conductor for variation of magnetic field with respect to distance $R$ from its axis along the radius.

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

For a thin conductor, the magnetic field inside it at every point is,

$B_{inside}=0$

Magnetic field outside it at distance $r$ from the axis is,

$B_{outside}=\frac{{\mu }_{o}I}{2\pi r}$

$\therefore B_{outside}\propto \frac{1}{r}$

Hence, option $\left(B\right)$ is the correct answer.