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    Are velocity selector and hall effect the same thing?
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    Well, with the velocity selector we're using a mechanism to select certain ions/particles with a certain velocity, hence the name. With the hall effect we're simply observing the effects of a magnetic field upon the net charge separation on a conductor (as far as I remember) so I'd have to say not entirely, although magnetism is used in both.

    In the velocity selector:
    - Electric field with a magnetic field arranged such that the magnetic force on our charged particle is opposite to the electric force
    - When at a certain velocity BQV = EQ, charge cancels out, velocity matters here, hence velocity is selected for
    - Charged particles of a certain velocity pass through. Others are deflected.
    - Mass does not matter here, as the forces will cancel out for that particle; if they don't, touch cannelloni.

    In the hall effect:
    - Magnetic field is applied across a conductor
    - Charges are separated across the conductor
    - Voltmeter can be used at ends of the conductor along line of charge separation and a potential difference can be measured and used to get the magnetic flux density or something else you might be interested in
    - Charge carriers, the electrons, are moved to one particular area by some net motion, which is what generates the difference, this net separation.
 
 
 
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