82708-Efield2

82708-Efield2 - Objectives for the Day: 08/27/08 )...

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Objectives for the Day: 08/27/08 1) Calculate electric fields due to continuous charge distributions. 2) Describe how electric fields influence charged particle motion. 3) Review the idea of a dipole moment. 4) Calculate the potential energy of a dipole in an electric field.
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The Electric Field The electric field is quantitatively defined as the force per unit charge at a point: Properties of the Electric Field 1) A charge distribution creates an electric field at every point in space. 2) The electric field obeys the law of superposition. 3) Electric field vectors point away from positive charges and toward negative charges. q F E = * If you put a test charge q at some point in space, the electric field tells you what force it will feel there.
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Electric Fields of Continuous Charge Distributions = = N i i i i r r kq E 1 2 ˆ q 1 q 2 q 3 q 4 q N q i = dq V = 2 ˆ r dq r k E r
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y x λ =charge per meter along the rod What is the field here? x = -a
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82708-Efield2 - Objectives for the Day: 08/27/08 )...

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