lecture 12

lecture 12 - 21.4 The Mass Spectrometer Ionized particles...

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21.4 The Mass Spectrometer Ionized particles are accelerated by a potential difference V . By conservation of energy, we know that this potential energy goes into the kinetic energy of the particle: PE E V v 2 1 EPE KE Δ = Δ qV mv = 2 Solve this for the speed, v : qV v 2 = m his is the speed the particle has when it enters the magnetic field It then This is the speed the particle has when it enters the magnetic field. It then gets bent into a circular path whose radius is given by the previous equation: mv arrange qrB lug in v from here: qB r = rearrange v m = Plug in v from here: 2 r *Thus, the mass of the deflected ion is proportional to B 2 . 2 2 B V qr m = By changing B , we can select a certain mass for a given radius.
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21.5 Force on a Current Moving charges in a magnetic field experience a force. A current is just a collection of moving charges, so a current will also feel a force in a magnetic field. N
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This note was uploaded on 08/04/2009 for the course PHYS 2002 taught by Professor Blackmon during the Spring '08 term at LSU.

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lecture 12 - 21.4 The Mass Spectrometer Ionized particles...

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