Abstract
The analysis of the problem of the rotating magnet previously given by us is extended. For the special cases considered, it is shown that, while the magnet exerts equal and opposite torques on the portions of the current circuit inside and outside of the magnet, neither of these portions individually exerts any torque on the magnet itself. The analysis is applied also to the case where the magnet is replaced by a solenoid, and to the case where the magnet is replaced by a brass cylinder and the flux through it is supplied by an outside coaxial solenoid. Pietenpol and Westerfield's recent criticism of our previous analysis is shown to be mistaken, and the fault in their method of attacking the problem is found to lie in the application of Amp\`ere's original law to the interaction between two current elements where in general it is invalid.
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