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Electrons emitted with negligible speed from an electron gun are accelerated through a potential difference V along the x-axis. These electrons emerge from a narrow hole into a uniform magnetic field Bdirected along this axis. However. Some of the electrons emerging from the hole make slightly divergent angles as shown in . show that these paraxial electrons are refocussed on the x-axis at a distance sqrt(8pi^2 mV)/(eB^2). |
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Answer» Solution :Givemagnetic field = B, Potential different = V, ltbr. MASS of electron = m, Charge = q Let electtric field be `E' = (V)/r` `v^(2) = 2 xx a xx s`[u = 0)` TIME taken by particle to cover the are A since the accinis along'y'AXIS it travel along - axis in uniformvelocity Therform`S = v xx t` . |
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