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What is the velocity of a beam of elections that produces no deflects when simultaneously subjected to an electric field of 3.8*10 and a magnetic field of 2.5 * 10 both field being mutually perpendicular and each normal to the beam |
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Answer» electron beam is not deflected then,F m =EeBev=Eev= BE ACCORDING to the law of conservation of energy21 mv 2 =EVV= m2eV m2eV = BE me = 2VB 2 E 2 |
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