Question

A long hollow tube is carrying an electric current along its length distributed uniformly on its circumference. The magnetic field 

(a) increases linearly from the axis to the surface 

(b) is constant inside the tube 

(c) is zero only on the axis 

(d) is zero just out-side the tube

Answer 1

Correct option: (b) is constant inside the tube

Explanation: 

For such a symmetric configuration , the field is zero, every where inside the tube. Hence constant.