Wed July 11, 2012 By: Hardik Chauhan

A wheel with 10 metallic spokes each 0.5m long is rotated with a speed of 120rpm in a plane normal to earth's magnetic field at the place. If the magnitude of the field is 0.40 gauss , what is the induced emf between the axle and the rim of the wheel.

Expert Reply
Thu July 12, 2012
B = 0.4Guass = 4 x 10-5 T
Each spoke will act as a battery connected parallely between two terminals.
emf produced by a rod moving with a velocity v perpendicular to a magnetic field will be = l.B x v
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