Imagine a solid, non-conducting cylinder at rest in IRF K, with a positive spherical charge centered on one end and a negative spherical charge on the other end. Each charge experiences an electric force toward the other. The cylinder is compressed, but there is no torque.(adsbygoogle = window.adsbygoogle || []).push({});

Let us say that the cylinder’s axis makes an angle, A, with the x-axis, such that 0<A<90 degrees. Viewed from frame K’, each charge experiences a net electromagnetic (Lorentz) force that does not point along the cylinder’s axis. Together the charges exert a nonzero torque about the cylinder’s midpoint. Yet in K’ (as in K) the cylinder does not rotate. What counteracts the Lorentz torque in K’?

Bonus question: why don’t the charges slide/roll off the cylinder ends in K’?

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# Imagine a solid, non-conducting cylinder at rest in IRF K, with a

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