Question: A toroidal solenoid with 500 turns is wound on a ring with a mean radius of 2.90 cm. Find the current in the winding that

A toroidal solenoid with 500 turns is wound on a ring with a mean radius of 2.90 cm. Find the current in the winding that is required to set up a magnetic field of 0.350 T in the ring
(a) If the ring is made of annealed iron (Km = 14(0) and
(b) If the ring is made of silicon steel (Km = 52(0).

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