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Statement of a problem № 3814

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Electrons are liberated with zero velocity from the negative plate of a parallel plate condenser, in which there is a constant magnetic field B parallel to the plates. If the separation of the plates is d and the potential across them is V, show that the electrons only arrive at the positive plate if d^2 < 2mV/eB^2

Solution:
Electrons are liberated with zero velocity from the negative plate of a parallel

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