Electromagnetic Induction and the Conservation of Momentum in the Spiral   Paradox
  The inversion of cause and effect in the classic description of electromagnetism, gives rise to a conceptual error which is at the bottom of many paradoxes and exceptions. At present, the curious fact that unipolar induction or the Faraday Disc constitutes an exception to the Faraday induction law is generally accepted. When we establish the correct cause and effect relationship a close connection appears between mechanics and electromagnetism, as does a new induction law for which paradoxes or exceptions do not occur. Some paradoxical experiments in unipolar induction involving the unique geometry of the spiral are described demonstrating the inversion of cause and effect. The emf and torque of the Faraday Disc and the conducting spiral is due to the continuous variation of the electromagnetic angular moment of the continuous current. This experiments confirm the Lorentz Force and invalidate Faradays Induction Law. They show how in a closed circuit emf and unipolar torque are not produced by the variation in magnetic flux, which is constant, but by two variations in the electromagnetic angular moment. The three possible ways of varying the electromagnetic angular moment generated by the circulation of the charges gives rise to the different forms of electromagnetic induction. 
Albert Serra