Two charges, q1=q2=q>0, are held apart by a dielectric rod of length L. Everything is at rest in the xy-plane of IRF K, with x1=y1=0 and x2=L cos(theta), y2=L sin(theta), 0<theta<pi/2.
Viewed from frame K’, moving in the positive x-direction of K at speed v, the Lorentz forces on the two...