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A copper pipe has with thick walls has an inner radius 5mm and outer radius 9mm....

A copper pipe has with thick walls has an inner radius 5mm and outer radius 9mm. The current flowing in the pipe is 4.0 A. Determine a. the magnetic field at 4mm from the center b. the magnetic field at 7mm from the center

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Answer #1

a) At   , the point lies inside the inner radius of copper pipe.

The magnetic field inside a hollow part of a cylinder is zero ( an amperean loop encloses no current , )

b) At

The enclosed current in the amperean loop is

Magnetic field at 7 mm from the center is

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