A coaxial cable has an inner cylindrical conductor surrounded by cylindrical insulation and an outer cylindrical conducting shell.The outer shell carries the same current but in the opposite direction from that in the inner conductor as shown.If the coaxial cable sits in a uniform magnetic field directed upwards with respect to the cable,the effect of the field on the cable is

Question

Quizplus · Accepted Answer

If the coaxial cable sits in a uniform magnetic field directed upwards with respect to the cable, a magnetic force will be applied to the current in the inner conductor and another force will be applied to the current flowing in the opposite direction in the outer conductor. The magnetic forces on the two conductors will be equal and opposite, so there will be no net force on the cable as a whole. However, the magnetic forces will cause a slight shift of the inner conductor to the left and the outer conductor to the right, resulting in option D as the correct answer.

A Coaxial Cable Has an Inner Cylindrical Conductor Surrounded by Cylindrical