Unformatted text preview: s = R and d < z < d , and then through the two end caps at z =+/d , and sum. Does the result agree with what you expect from Gauss’ theorem? 7. (b) Find the electric field a distance z above the center of a flat circular disk of radius R that carries a uniform surface change σ . After finding this general expression, explore the limit where R>> z and the limit where R<< z . Do these limits make physical sense? (a) To start this problem, it is advantageous to first calculate the electric field a distance z above the center of a flat uniformly charged ring of radius R . (by inspection what is the electric field at z =0?)...
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 '06
 LECLAIR, A
 Charge, Magnetism, Work, Electric charge, Purcell Problem

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