AP Free Response Question
2002 Form B - B5
Printer Friendly Version
Two parallel conducting plates, each of area 0.30 m
^{2}
, are separated by a distance of 2.0 x 10
^{-2}
m of air. One plate has charge +Q; the other has charge —Q. An electric field of 5000 N/C is directed to the left in the space between the plates, as shown in the diagram above.
(a) Indicate on the diagram which plate is positive (+) and which is negative (-).
(b) Determine the potential difference between the plates.
(c) Determine the capacitance of this arrangement of plates.
An electron is initially located at a point midway between the plates.
(d) Determine the magnitude of the electrostatic force on the electron at this location and state its direction.
(e) If the electron is released from rest at this location midway between the plates, determine its speed just before striking one of the plates. Assume that gravitational effects are negligible.
Topic Formulas
Description
Published Formula
capacitance
Coulomb's Law
elastic potential energy
electric field
electric potential energy
energy stored in a capacitor
kinetic energy
parallel-plate capacitor
potential and electric field strength
potential due to a collection of point charges
potential energy
power
power
work
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