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A printed circuit board coil on support handle with 5 and 10 turns rated at 2A. The lower arm of the coil is 75mm long (minimum) and 20mm wide. A heavy-duty printed circuit coil gives 5 or 10 turns. It can be placed between the poles of a permanent magnet on the top pan of a chemical balance so that when a current is passed through it a force is exerted on the magnet due to the magnetic effect of the current. Quantitative measurements can be taken to investigate the formula F = BIL.