Are velocity selector and hall effect the same thing?
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A-level physics Magnetic Fields watch
- Thread Starter
- 02-04-2017 19:07
- 02-04-2017 19:34
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.