Question

A toroid having a square cross section, 5.73 cm on a side, and an inner radius of 21.3 cm has 400 turns and carries a current of 1.03 A. (It is made up of a square solenoid instead of round one bent into a doughnut shape.) What is the magnitude of the magnetic field inside the toroid at (a) the inner radius and (b) the outer radius?

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