Properties of an electromagnet

AI Thread Summary
The discussion focuses on the relationship between current and magnetic field strength in electromagnets, particularly when wrapping wire around metal. Participants mention that relevant formulas can be found in textbooks and online resources like Wikipedia. Concerns are raised about experimenting with high-powered magnets, specifically using a car battery, due to safety risks. It is noted that while the magnetic field itself is generally safe if kept away from sensitive materials, caution is advised when handling high-powered electrical sources. Overall, understanding the math behind electromagnets is essential for safe experimentation.
Jaymo3141
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We are going over magnetism in my Physics 2 course but we barely covered electromagnets. I was wondering what the math equation for field strength would be for an electromagnet. In other words, how is current related to field strength when you wrap a wire around a piece of metal. Also I was wondering because i wanted to experiment with a high powered magnet. Like a car battery. Too dangerous?
 
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You can find many relevant formulas at Wikipedia or in all textbooks about electromagnetism.

Also I was wondering because i wanted to experiment with a high powered magnet. Like a car battery. Too dangerous?
I would be worried about the car battery. The magnetic field itself, if it is far away from anything reacting to magnetic fields, should be fine.
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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Thread 'Why measure the speed of light in one direction?'

It may be shown from the equations of electromagnetism, by James Clerk Maxwell in the 1860’s, that the speed of light in the vacuum of free space is related to electric permittivity (ϵ) and magnetic permeability (μ) by the equation: c=1/√( μ ϵ ) . This value is a constant for the vacuum of free space and is independent of the motion of the observer. It was this fact, in part, that led Albert Einstein to Special Relativity.
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