A long straight cylindrical shell has inner radius $R_{i}$ and outer radius $R_{o}$ . It carries current $i$ , uniformly distributed over its cross section. A wire is to be placed parallel to the cylinder axis, in the hollow region .

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

The magnetic field is zero everywhere in the hollow region. We conclude that the wire may be anywhere in the hollow region but must be carrying current $i$ in the same direction as the current in the shell

The magnetic field is zero everywhere in the hollow region (r $<$ $R_{i})$ We conclude that the wire is on the cylinder axis and carries current $i$ in the same direction as the current in the shell.

The magnetic field is zero everywhere in the hollow region. We conclude that the wire does not carry any current

The magnetic field is zero everywhere outside the shell $(r > R_{0})$ We conclude that the wire is on the cylinder axis and carries current $i$ in the direction opposite to that of the current in the shell.

answer is B, D.

(Unlock A.I Detailed Solution for FREE)