Hi everybody. This is my first thread ever on this forum :S I'm in a first year physics class, and the other day we did a lab involving a c.c.c (current carrying conductor) and a magnet on a balance. The c.c.c was a wire which completed a circuit. One had a magnet assembly which was placed on an electric balance, with a gap between the North and the South poles. Before beginning, one measured the weight of the magnet. After this, the wire was positioned between the two poles, and the power source was turned on. As the amount of current was increased, the weight of the magnet on the balance decreased. This experiment combined the motor principle with Newton's Laws. Because the c.c.c. was within the magnetic field of the magnet, it experienced a force. The equation for this is F = IL*B. Using Newton's Third Law, one could then determine that the magnetic field exerted a force on the magnet, and vice versa, which caused the magnet to be lifted a bit, causing this loss of weight. We were given the equation of W = mg +/- ILBsin(90) to represent this. I understand all of this, however, I don't understand how the movement of the c.c.c. causes a force on the magnet. Obviously, the magnet is being pulled upwards in order to have less weight, but I don't understand where this pull comes from? Thank you for any help!