physics exam 2
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physics exam 2
what are some characteristics of potential on capacitor plates?
all points have same electric potential. They are equipotential surfaces.
q and C
what does capacitance depend on?
geometry of the plates not charge or potential differences
for plates in parallel what is the potential difference
parallel plates and capacitance
add them up
capacitance is 1/Ceq=1/C1...
what happens to charge when dielectrics inserted when it is attached to batterY? without battery?
increase by kappa
without battery, charge remains constant, while potential difference decrease by kappa
what does work on charge carriers and maintain a potential difference between their terminals?
battery, emf devices
what is the direction of emf
from neg terminal to positive
what is the work per unit charge the the device does in moving charge from low potential to high potential terminal
to move through resistance in direction of current, what is the change in potential
-iR; +iR for opposite direction
to move through ideal emf device in direction of emf arrow
change is +E
what is the potential on capacitor plates?
they are all euipotential, same potential
what is capacitance a measure of?
how much charge must be put not he plates to produce a certain potential difference between them
how are electrons driven through the wires?
by an electric field set up by the battery
what is a resistor
a conductor with a specified resistance
when the resistance of the device is independent of the magnitude and polarity of the applied potential difference
do work on charge carriers and thus maintain a potential difference between their terminals
emf of an emf device
is the work per unit charge that the device does in moving charge from its low potential terminal to its high potential terminal.