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A toroidal selenoid has inner radio r1= 15.0 cm and outer radius r2= 18.0 cm. The selenoid has 250 turn and carries a current of 8.50 A. What is the magnitude of the magnetic field at the following distance from the center of the torus

a) 12.0 cm

b)16.0 cm

c) 20.0 cm

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