Question

A hollow copper tube carries.

Why is B = 0 inside the tube? is B non zero outside the tube?
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Answer 1

Explanation:

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The charges always reside or move on the outer of a conductor.

Since inside the tube current is zero hence

B = 0 (according to Ampere’s law)

The outer surface of the tube behaves like a set of parallel wires carrying current down their Length.

The magnetic field outside the tube, exists; and its direction is given by the right hand grip rule.

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Answer 2

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A displacement vector of magnitude 4 makes an angle 30 with X-axis.

The magnetic field outside the tube, exists; and its direction is given by the right hand grip rule.Since inside the tube, current is zero, hence B = 0 (according to Ampere’s law).