PHYS208 3/30 Class
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Subtitled: "How do we know what we know about the electron?"
Potential Energy of a Dipole in a Field
Completion of previous class...
Evaluation of work done in rotating a dipole away from its equilibrium position:
Thomson and the first measurement of q/m for the electron (cathode rays)
Velocity selector configuration of crossed electric and magnetic fields.
The Hall Effect
- Determines sign of charge carriers responsible for electric current
- Demonstrates that electron is charge carrier in typical metal
- n-type semiconductor has negative charge carrier (electron);
p-type semiconductor has postive charge carrier (missing electron or hole)
- Can be used to measure concentration of charge carriers
- Depends on doping levels in semiconductors
- Can be used to measure magnetic fields (as in PHYS208 lab)
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Last updated March 30, 1998.
Copyright George Watson, Univ. of Delaware, 1997.