18.13.Set Up:For two oppositely charged parallel plates,where is the potential difference betweenthe two plates,Eis the uniform electric field between the plates and dis the separation of the plates. An electric fieldexerts a force on a charge placed in the field. An electron has charge and massSolve: (a)(b)Reflect:The electric field is the same at all points between the plates (away from the edges) so the accelerationwould be the same at all points between the plates as it is for a point midway between the plates.18.14.Set Up:For two oppositely charged sheets of charge,The positively charged sheet is the one athigher potential.Solve: (a)The electric field is directed inward, toward the interior ofthe axon, since the outer surface of the membrane has positive charge and points away from positive charge andtoward negative charge. Section 18.9 explores the effects of a material other than air between the plates.
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