Magnetic Force on a Current Loop
Consider loop in magnetic field as on right: If field is ^ to plane of loop, the net force on loop is 0!
If plane of loop is not ^ to field, there will be a non-zero torque on the loop!
http://wug.physics.uiuc.edu/courses/phys112/fall97/acts/lect13/act13b/sld001.htm
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