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Unformatted text preview: 17 . (18 in 7 th ) A toroid having a rectangular cross section ( a = 2.00 cm by b = 3.00 cm) and inner radius R = 4.00 cm consists of 500 turns of wire that carries a sinusoidal current I = I max sin t , with I max = 50.0 A and a frequency f = /2 = 60.0 Hz. A coil that consists of 20 turns of wire links with the toroid, as in Figure P31.17. Determine the emf induced in the coil as a function of time. 24 . (25 in 7 th) The homopolar generator , also called the Faraday disk , is a low voltage, highcurrent electric generator. It consists of a rotating conducting disk with one stationary brush (a sliding electrical contact) at its axle and another at a point on its circumference, as shown in Figure P31.24. A magnetic field is applied perpendicular to the plane of the disk. Assume the field is 0.900 T, the angular speed is 3 200 rev/min, and the plane of the disk....
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 Fall '10
 Zazubovits

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