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GRDixon

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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’?