E4 - Phy sics 7B WS E4 (rev. 3.0) Page 1 E-4. Conductors...

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Physics 7B WS E4 (rev. 3.0) Page 1 E-4. Conductors Questions for discussion 1 . In Physics 7B problems, we commonly consider “a ball of charge, with uniform charge per unit volume ρ .” How do you know that the ball in such a problem is made of non-conducting material, such as plastic? 2 . Give an intuitive justification for each of the following facts about conductors, all of which hold in equilibrium: a) Within a conducting material, the electric field vanishes. b) Any net charge on a conductor must reside on a surface of the conductor. c) The electric field at a surface of a conductor is always perpendicular to the conducting surface.
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Physics 7B WS E4 (rev. 3.0) Page 2 3 . The figure shows two charged disks. One of them is made of plastic (with a uniform positive surface charge sprayed on it), and the other is made of metal (with excess positive charge on its surface). a) Which is which? b) Evidently, the surface charges on the metal disk cannot be uniformly distributed (otherwise they would create the same field as that created by the uniformly charged plastic disk). Do you think that the surface charges on the metal are concentrated more near the center of the disk, or more near the
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E4 - Phy sics 7B WS E4 (rev. 3.0) Page 1 E-4. Conductors...

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