Q. A long hollow copper tube carries a current $I.$ Then which of the following will be true?
A) The magnetic field $B$ will be zero at all points inside the tube
B) The magnetic field $B$ will be zero only at points on the axis of the tube
C) The magnetic field $B$ will be maximum at points on the axis of the tube
D) The magnetic field will be zero at any point outside the tube
Explanation
(d) The magnetic field $B$ will be uniform inside the hollow tube, excepts near the ends. Also magnetic field is zero at any point outside the tube.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.