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A current balance is a device to measure magnetic forces. It is constructed from two parallel coils, each with an average radius of 12.5 cm.
A current balance is a device to measure magnetic forces. It is constructed from two parallel coils, each with an average radius of 12.5 cm. The lower coil rests on a balance; it has 20 turns and carries a constant current of 3.00 A. The upper coilt suspended 0.314 cm above the lower coil, has 50 turns and a current that can be varied. The reading of the balance changes as the magnetic force on the lower coil changes. What current is needed in the upper coil to exert a force of 1.30 N on the bottom coil? mwdghlowaooil
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