Calculate the magnetic field produced in the center of space

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You are given a pair of Hemholtz coils, each with radius R = 12 cm, containing 140 turns of wire in each coil. In order to obtain the most uniform magnetic field possible between the coils, with what distance should you separate them? (this was 12cm) You run a current of 12 A through each coil. Calculate the magnetic field produced in the center of the space between the coils.

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