1.

A long straight cylindrical shell has inner radius Ri and outer radius Ro. It carries current i, uniformly distributed over its cross section. A wire is parallel to the cylinder axis, in the hollow region (rRo). We conclude that the wire: A. is on the cylinder axis and carries current i in the same direction as the current in the shell B. may be anywhere in the hollow region but must be carrying current i in the direction opposite to that of the current in the shell C. may be anywhere in the hollow region but must be carrying current i in the same direction as the current in the shell D. is on the cylinder axis and carries current i in the direction opposite to that of the current in the shell E. does not carry any current

Answer»

D. is on the cylinder axis and carries current i in the direction opposite to that of the current in the shell



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