How is the Magnetic Field Shaped in a Hollow Cylinder Electromagnet?

AI Thread Summary
A hollow cylinder electromagnet, when wrapped with coils on the outside, generates a magnetic field similar to that of a solenoid. The magnetic field lines inside the hollow cylinder are parallel and uniform, indicating a strong magnetic field in the center. The field strength decreases outside the cylinder, where the lines spread out. There is minimal difference in the magnetic fields between a standard solenoid and a hollow cylinder configuration, as both exhibit similar characteristics. Understanding these principles is essential for applications in electromagnetism and related technologies.
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Ok, everyone knows what an electromagnet is--the most obvious example being wire coils around a nail through which a charge is passed. If you had a hollow cylinder, and the coils were wrapped around the outside; how would the magnetic field be shaped?

Illustration (Please assume that there are more coils than shown and that the right side of the cylinder is not slanted.):

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You have what is known as a solenoid. You can easily find B-flux lines for this configuration in most physics or electromagnetics textbooks.
 
Thanks, I have one right in front of me. Is there any difference in the fields of a solenoid and a hollow one?
 

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