Comment on ``Torque or no torque? Simple charged particle motion   observed in different inertial frames,'' by J. D. Jackson [Am. J. Phys. 72   (12), 1484-1487 (2004)]
  In this paper it is shown that the real cause of the apparent electrodynamic paradox discussed by Jackson [J. D. Jackson, Am. J. Phys. 72, 1484 (2004)] is the use of three-dimensional (3D) quantities E, B, F, L, N, .. . When 4D geometric quantities are used then there is no paradox and the principle of relativity is naturally satisfied. 
Tomislav Ivezic