Lec06-22009

Lec06-22009 - cture 6- cture 6- 1 Thin sheet of any charge...

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Unformatted text preview: cture 6- cture 6- 1 Thin sheet of any charge distribution ' R disk E E E + = + ur ur ur ' L disk E E E- = + ur ur ur Just to left of disk Just to right of disk $ $ ( ' ) ( ' ) 2 2 disk disk disk disk E E E E E E E n n +- +- = +- + =- =- - = ur ur ur ur ur ur ur tiny disk n E = cture 6- cture 6- 2 Charges and fields of a conductor In electrostatic equilibrium, charges inside a conductor do not move. Thus, E = 0 everywhere in the interior of a conductor . Since E = 0 inside, there are no net charges anywhere in the interior. Net charges can only be on the surface(s). The electric field must be perpendicular to the surface just outside a conductor, since, otherwise, there would be currents flowing along the surface. cture 6- cture 6- 3 Electrostatic Shielding (Continued) + + + + + + Add Q If you now add charge Q to the conductor and/or Q on the outside of the conductor, the interior electric fields do not change. Q If you move charge q in the cavity, the exterior electric fields and the extreior charge distribution are not affected. Conducting shell electrostatically shields its exterior from changes on the inside. q Conducting shell electrostatically shields its interior from changes on the outside, too. cture 6- cture 6- 4 READING QUIZ 1 IN WHAT DIRECTION CAN YOU MOVE A TEST CHARGE RELATIVE TO AN ELECTRIC FIELD SO THAT THE ELECTRIC POTENTIAL DOES NOT CHANGE? A| Move in the direction of the electric field lines. B| Move opposite to the direction of the electric field lines. C| Move from point A in the electric field to point B in in the electric field along an arbitrary path. D| Move relative to the electric field along a path which is everywhere perpendicular to the electric field. cture 6- cture 6- 5 Electric Potential Energy of a Charge in Electric Field Coulomb force is conservative => Work done by the Coulomb force is path independent ....
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Lec06-22009 - cture 6- cture 6- 1 Thin sheet of any charge...

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