Physics Help Forum Force Inside a Solenoind
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 Feb 2nd 2009, 10:05 PM #1 Junior Member   Join Date: Feb 2009 Posts: 1 Force Inside a Solenoind Hello I'm working on a personal project which involves a solenoid. I'm trying derive an equation for the Force(N) that an object would experience due to the flux density inside the coil. The flux density can be calculated relatively easily by the fallowing equation. Given the material permeability what force would this object experience due to the B field created by the solenoid? Any help would be greatly appreciated.....
May 19th 2009, 07:36 PM   #2
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 Originally Posted by wavestrime Hello I'm working on a personal project which involves a solenoid. I'm trying derive an equation for the Force(N) that an object would experience due to the flux density inside the coil. The flux density can be calculated relatively easily by the fallowing equation. Given the material permeability what force would this object experience due to the B field created by the solenoid? Any help would be greatly appreciated.....
It depends on what the object is and what it's doing. If you can consider the field inside the solenoid to be uniform and the object to be a bar magnet the the total force on the object would be zero. The magnetic field attempts to force the north pole in one direction and the south pole in the other direction. The magnitudes will be the same but the direction will be opposite. The total force is thus zero. If the object is a charged particle and its at rest then the force is zero. If the ovbject is moving the the force will be given by F = qvxB (i.e. the charge times the cross product of the magnetic field and the velocity.

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