Lecture_04 - + E Force due to E created by positive charge...

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Unformatted text preview: + E Force due to E created by positive charge shifts electron cloud and nucleus in opposite directions: electric dipole . An atom is said to be polarized when its electron cloud has been shifted by the influence of an external charge so that the electron cloud is not centered on the nucleus . Polarization of Atoms it is not a permanent dipole an induced dipole is created when a neutral object is polarized by an applied electric field An applied electric field creates induced dipoles: p = qs = E - polarizability of a material r r q E 4 1 2 1 1 = r r q p 4 1 2 1 = r r q E 2 4 1 5 1 2 2 = r r q F 2 4 1 5 2 1 2 1 = 1) 2) 3) 4) r r q F 2 4 1 5 2 1 2 2 = 5) Neutral atoms are attracted by charges! Interaction strength ~ 1/r 5 r r q E 4 1 2 1 1 = r r q p 4 1 2 1 = r r q E 2 4 1 5 1 2 2 = r r q F 2 4 1 5 2 1 2 1 = 1) 2) 3) 4) r r q F 2 4 1 5 2 1 2 2 = 5) Neutral atoms are attracted by charges! Interaction strength ~ 1/r 5 A Neutral Atom and a Point Charge Repulsion: r r q q F R 4 1 2 2 1 = F R Attraction: r r q N F A 2 4 1 5 2 1 2 = F A Total: r r q N r q q F 2 4 1 4 1 5 2 1 2 2 2 1 = q 1 q 2 Interaction of like-charged Objects Interaction of Charged Objects...
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This note was uploaded on 04/02/2008 for the course PHYS 272 taught by Professor K during the Winter '07 term at Purdue University-West Lafayette.

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Lecture_04 - + E Force due to E created by positive charge...

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