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A wheel with 10 metallic spokes each 0.5 m long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component of earth’s magnetic field H_Eat a place. If H_E= 0.4 G at the place, what is the induced emf between the axle and the rim of the wheel? Note that 1 G = 10^(-4) T. |
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Answer» SOLUTION :INDUCED EMF `= 1/2 omega B R^(2)` `=1/2 xx 4 pi xx 0.4 xx 10^(-4) xx (0.5)^(2)` `=6.28 xx 10^(-5)V` The NUMBER of spokes is immaterial because the emf.s ACROSS the spokes are in parallel. |
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