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Unformatted text preview: Lecture 6 Lecture 6-1 Electrostatic Shielding + + + + + + Add Q If you now add charge Qto the conductor and/or Qon 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. Lecture 6 Lecture 6-2 Two conducting plates The excess charge on one plate attracts the excess charge on the other plate. The surface charge density vanishes on the outer faces but is doubled on the inner faces. The magnitude of the electric field is twice as much as that near an isolated plate and is zero everywhere else. Case (c) is not a simple superposition of cases (a) and (b), because the electric charges are re-distributed on both plates when they are brought near each other. 1 1 1 2 = Lecture 6...
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