Answer: A closely wound coil has a radius of 6.00 cm and
Chapter 28, Problem 28.38(choose chapter or problem)
A closely wound coil has a radius of 6.00 cm and carries a current of 2.50 A. How many turns must it have if, at a point on the coil axis 6.00 cm from the center of the coil, the magnetic field is \(6.39 \times 10^{-4} \ \mathrm {T}\)?
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