Two Newtonmeters are fixed at the extremes of two magnets placed in a small tubes, with their opposite poles facing each other. Pulling the two Newtonmeters, in order to separate the two magnets at a given distance, the lengthening of the springs of the two Newtonmeters is the same. We measure the lengthening of each spring D_L (or rather, the force exerted by each Newtonmeter) for the different distances of equilibrium d of the magnets and we find that, for small distances between the poles of the magnets, the product D_L*dⁿ=const, with n>2.
© University of Udine