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On Sunday, Jan 26, 2003, at 20:51 US/Eastern, David Rutherford asked:
Bob LaMontagne wrote:
More explicitly, what the students do in the lab is the following:
They measure the
slow discharge of the capacitor through a resistor, R. They record
the current at
regular time intervals, dt, say 5 seconds. They then graph the
current as a function
of time and obtain the total charge.
Why don't you assume that an equal amount of opposite charge flows in
the opposite direction? . . .
That assumptions would not be acceptable; we know that in materials
from which common resistors are made only electrons are free carriers.