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A metal rod of length 1m, rotates about its one end in a plane at right angles to a horizontal magnetic field of induction `7/22 xx 10^(-4)T`. If its frequency of rotation is 10 Hz, then the magnitude of induced e.m.f. IsA. 5mVB. 1mVC. 0.5VD. 1V |
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Answer» Correct Answer - B Flux `phi=B.A. Area swept//sec= (dA)/(dt) = f cdot pi r^(2)` `:. E = (d phi)/(dt)=B(dA)/(dt)=Bf cdot pi r^(2)` `:. E = 7/22xx10^(-4)xx10xx22/7xx1^(2)=1 mV`. |
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