A wheel with 20 metallic spokes each of length 0.8 m long is rotated with a speed of 120 revolution per minute in a plane normal to the horizontal component of earth magnetic field H at a place. If H = 0.4 x 10 -4 T at the place, then induced emf between the axle and the rim of the wheel is
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Here , 
Emf induced across the ends of each spoke
Note : Number of spokes is not relevant because the emfs across the spoke area is parallel.
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