Teaching Minds-On Experiments on Electromagnetism in Secondary Schools


Behaviour of two springs under tension

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 DL (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 DL*dn=const, with n>2.
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