Unit_01_4_Web_Lecture_Notes - We will group dielectrics...

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Notes from lecture: 28 Jan 2008. Now consider a flat two dimensional (i.e. thin) sheet that extends to infinity with a uniform charge distribution. By symmetry, the electric field due to the sheet is constant in direction and magnitude on either side of the sheet. The electric field line representation for such a sheet looks like if the uniform charge distribution is positive, and like if the uniform charge distribution is negative. We can then construct the field due to a pair of oppositely charged infinite sheets as shown below. Between the sheets, the field is twice as strong as in the case of either of the single sheets, and outside the sheets, the field vanishes.
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Along with several printed handouts available on the course web page, today we also discussed insulators, which we will call dielectrics, in the presence of an electric field.
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Unformatted text preview: We will group dielectrics into two types: polar and non-polar. In polar dielectrics, the molecules intrinsically have some separation of positive and negative charge. Water molecules are an example of such an intrinsic charge separation. If an electric field is applied to a polar dielectric molecule, the molecule will first experience a torque (below left). After some time, the molecule will tend to align with the field in such a way that the torque vanishes (below right). A non-polar dielectric has no intrinsic charge separation from one side of the atom or molecule to the other. When an electric field is applied to a non-polar dielectric molecule, the charge distribution, which is at first symmetric (below left) will deform in such a way that it has an overall induced charge separation (below right)...
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Unit_01_4_Web_Lecture_Notes - We will group dielectrics...

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