Answer: A wooden ring whose mean diameter is 14.0 cm is
Chapter 28, Problem 28.51(choose chapter or problem)
A wooden ring whose mean diameter is 14.0 cm is wound with a closely spaced toroidal winding of 600 turns. Compute the magnitude of the magnetic field at the center of the cross section of the windings when the current in the windings is 0.650 A.
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