Question

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

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

Answer 2

The correct answer is (D) :
Inside a hollow cylindrical conductor with uniform current distribution net magnetic field is zero in hollow space.
But outside the cylindrical conductor
$B ∝ \frac{1}{r}$