McKenna’s Paradox: Charged Particle Exiting the Side of a Solenoid Magnet
نویسندگان
چکیده
The “science fact” section of the March 1965 issue of Analog magazine featured an article by Richard P. McKenna that proposed a “motor” which would consist of a solenoid magnet that can rotate about its axis, plus a radioactive source mounted on that axis [1]. When a charged particle is emitted by a radioactive decay it traverses the solenoid field, which bends the particle’s trajectory, giving it some angular momentum. By Newton’s 3rd law (argues McKenna), the reaction force on the magnet creates a torque that will cause the solenoid to spin in the opposite sense to that of the particle’s trajectory.
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