The general form of Gauss's law describes how a charge cre- ates an electric field in a material, as well as in vacuum: Tin E · dA = where e = Ke, is the permittivity of the material. (a) A sheet with charge Q uniformly distributed over its area A is sur- rounded by a dielectric. Show that the sheet creates a uni- form electric field at nearby points with magnitude E = Q/2 Ae. (b) Two large sheets of area A, carrying opposite charges of equal magnitude Q, are a small distance d apart. Show that they create uniform electric field in the space between them with magnitude E = Q/Ae. (c) Assume the negative plate is at zero potential. Show that the positive plate is at potential Qd/Ae. (d) Show that the capacitance of the pair of plates is given by C = Ae/d = KA€,/d.

Principles of Physics: A Calculus-Based Text
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Chapter19: Electric Forces And Electric Fields
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The general form of Gauss's law describes how a charge cre-
ates an electric field in a material, as well as in vacuum:
Tin
E · dA =
where e = Ke, is the permittivity of the material. (a) A sheet
with charge Q uniformly distributed over its area A is sur-
rounded by a dielectric. Show that the sheet creates a uni-
form electric field at nearby points with magnitude E =
Q/2 Ae. (b) Two large sheets of area A, carrying opposite
charges of equal magnitude Q, are a small distance d apart.
Show that they create uniform electric field in the space
between them with magnitude E = Q/Ae. (c) Assume the
negative plate is at zero potential. Show that the positive
plate is at potential Qd/Ae. (d) Show that the capacitance of
the pair of plates is given by C = Ae/d = KA€,/d.
Transcribed Image Text:The general form of Gauss's law describes how a charge cre- ates an electric field in a material, as well as in vacuum: Tin E · dA = where e = Ke, is the permittivity of the material. (a) A sheet with charge Q uniformly distributed over its area A is sur- rounded by a dielectric. Show that the sheet creates a uni- form electric field at nearby points with magnitude E = Q/2 Ae. (b) Two large sheets of area A, carrying opposite charges of equal magnitude Q, are a small distance d apart. Show that they create uniform electric field in the space between them with magnitude E = Q/Ae. (c) Assume the negative plate is at zero potential. Show that the positive plate is at potential Qd/Ae. (d) Show that the capacitance of the pair of plates is given by C = Ae/d = KA€,/d.
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