Question

An infinitely long hollow conducting cylinder with radius $R$ carries a uniform current along its surface. Choose the correct representation of magnetic field $\left(B\right)$ as a function of radial distance $\left(r\right)$ from the axis of cylinder.

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

Inside a hollow cylindrical conductor with uniform current distribution net magnetic field is zero in hollow space.
But outside the cylindrical conductor $B\propto \frac{1}{r}$
$\Rightarrow$
Graph in option d would be the correct representation.