# A hollow copper tube carries a current along its length. Why is B = 0 inside the tube? Is B nonzero outside the tube?

### Physics for Scientists and Enginee...

9th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781305116399

Chapter
Section

### Physics for Scientists and Enginee...

9th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781305116399
Chapter 30, Problem 30.4CQ
Textbook Problem
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## A hollow copper tube carries a current along its length. Why is B = 0 inside the tube? Is B nonzero outside the tube?

To determine

The reason for zero value of magnetic field density inside hollow tube carrying current and whether the value of magnetic field density is zero outside the tube.

### Explanation of Solution

According to Ampere’s Law, the line integral of magnetic field about a closed loop is equal to the total current passing through that surface. For hollow conductor the value of the current passing through the hollow space inside the conductor is zero, thus the value of the magnetic field density inside the hollow conductor is zero.

For the case of magnetic field density outside the hollow conductor the value of the current passing through the surface is equal to the current through the hollow conductor that is non zero, thus the value of the magnetic field density outside the hollow conductor is non zero...

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