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Jan4-13, 08:26 AM
jtbell's Avatar
P: 11,739
I'm not familiar with that formula, but I suspect it assumes that the metal object is much larger than the solenoid. If you bring one end of a solenoid with a diameter of 1 cm close to an iron cube, would you expect the force to be significantly different for a 1-m cube versus a 10-m cube?