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A toroid that has a mean radius equal to 28.5 cm and circular loops with radil equal to 2.50 cm is wound with a superconducting wire. The wire has a length equal to 1000 m and carries a current of 440 A (a) What is the number of turns of the wire? (b) What is the magnetic field strength and magnetic energy density at the mean radius? MJ/m3 (c) Estimate the total energy stored in this toroid by assuming that the energy density is uniformly distributed in the region inside the toroid. kJ

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