PHY 2049: Physics II
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Tutoring Center is open in room NPB 1215,
M-F 12:00AM -4:00PM. It is free.
Exam I had an average of 7.5, a standard
deviation of 2.26. A fine performance.
HITT
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A parallel-plate capacitor has a plate area of
0.3m2 and a plate separation of 0.1mm. If
the charge on each plate has a magnitude
of 5x10-6 C then the force exerted by one
plate on the other has a magnitude of
about:
A. 0
B. 5N
C. 9N
D. 1 x104 N
E. 9 x 105 N
HITT2
Each of the four capacitors shown is 500 μF.
The voltmeter reads 1000V. The magnitude
of the charge, in coulombs, on each capacitor
plate is:
A. 0.2
B. 0.5
C. 20
D. 50
E.
none of these
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Currents and Resistance
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Current and current density
Resistance and Resistivity
Thermal variations
Ohm’s law
Power in Electrical Circuits
Curretns and Current Density
dq
i 
dt
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Current
Current density
Resistance
Drift velocity
Resistivity
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Power P  iV  i R  V
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j i/ A
V  IR
j  nevd
R  l / A
2
2
/R
materials
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Metals
Semiconductors
Insulators
Superconductors (Florida connection)
Superconductors
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J. R. Schrieffer (!931- )
http://nobelprize.org/nobel_prizes/physics/laureates/1972/schrieffer-bio.html
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National High Magnetic
Field Laboratory