Lect_9_note

Lect_9_note - Chapter 26 - 2 Capacitance Capacitance A...

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Chapter 26 - 2 Capacitance
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Capacitance ± A parallel-plate capacitor ± A conductor is placed in the middle of the two plates symmetrically. ± The new capacitance is: d’ / o o ε A QQ Q C VE dQ d ε Ad === =
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Capacitance ± A parallel-plate capacitor ± A insulator is placed in the middle of the two plates symmetrically. ± The new capacitance is: d’ / o o ε A QQ Q C VE dQ d ε Ad === =
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Dielectrics – An Atomic View ± The molecules that make up the dielectric are non-polar molecules ± The molecules that make up the dielectric are polar molecules, but are randomly oriented in the absence of an electric field
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Insulator : Dielectrics ± Polar molecules are those in which a separation exists between the average position of the negative charges and the average position of the positive charges ± Molecules without a permanent polarization are called nonpolar molecules +-
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Water Molecules ± A water molecule is an example of a polar molecule ± The center of the negative charge is near the center of the oxygen atom ± The x is the center of the positive charge distribution
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Oxygen Molecules ± An oxygen molecule is an example of a non-polar molecule
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This note was uploaded on 01/28/2011 for the course PHYS 011 taught by Professor Nianlin during the Fall '08 term at HKUST.

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Lect_9_note - Chapter 26 - 2 Capacitance Capacitance A...

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