1-15-08Lec03 - Lecture 3-1 Electric Dipoles Typical dipole...

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Unformatted text preview: Lecture 3-1 Electric Dipoles Typical dipole consists of positive and negative charges slightly displaced. General definition of dipole moments exists: ( ) 3 () p rrdr = ch h Water molecule can be thought of as consisting of 2 standard dipoles at an angle to each other. b Net neutral molecules can have electrical dipole moments b Permanent dipole moment (polar) vs. induced dipole moment Lecture 3-2 Electric Field due to an Electric Dipole () () 2 2 2 2 2 2 2 2 3 ( /2) ( /2) (1 ) (1 ) 2 2 (1 ...)(1 ...) 2 2 [1 ( )] ... E E E q q k k zd zd q d d k z z z q d d k z z z kqd d k O z z p z z + = = + = + = + + + = + = + At point P on z-axis: Where is the (magnitude of) dipole moment. p qd Lecture 3-3 Dipole Field Anisotropy () () 2 2 2 23/2 2 3/2 3 2 2 3 2 3 2 sin (/2) 2 [ (/2)] 2 (1 ) 4 3 (1 ...) 8 ... z E E E q k y d q d k y d qd d k y y qd k p d y y k y + = + = +...
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This note was uploaded on 04/07/2008 for the course PHYS 241 taught by Professor Wei during the Spring '08 term at Purdue University-West Lafayette.

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1-15-08Lec03 - Lecture 3-1 Electric Dipoles Typical dipole...

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