ENRCONGR - If isolated (separated) charges were present in...

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Electric Fields In and Near Conductors in Electrostatic Equilibrium An electric conductor has some mobile charges that are free to move in the conductor and along its surfaces. Electrostatic equilibrium means that charges are in static equilibrium . This means that there must be no net electric force on any mobile charge. 1. 0 = E r in a conductor in electrostatic equilibrium. If E r was in the conductor, then a mobile charge q would be acted on by a net electric force F 0 0 elec = E q r r , and would therefore have a nonzero acceleration and would therefore not be in equilibrium. No! + q elec F r E r 2. Any isolated (separated) charge on a conductor in electrostatic equilibrium can only be on its surfaces (outer and/or inner—if hollow).
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Unformatted text preview: If isolated (separated) charges were present in the conductor, then electric field lines would start or end on each charge, and E r would in there. ≠ 3. E r just outside the surface of a conductor in electrostatic equilibrium must be perpendicular ( ⊥ ) to the surface. No! E r + − If E r had a component parallel ( || ) to the surface ( E | | ≠ r ), then a mobile charge on the surface would be acted on by a force F q | | elec ≠ = E q r r , and would therefore have a nonzero acceleration and would therefore not be in equilibrium. No! + q elec F r || E r ⊥ E r Mobile electric charges in/on the conductor redistribute until these conditions for electrostatic equilibrium are met....
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This note was uploaded on 12/27/2011 for the course PHYSICS 2208 at Cornell.

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