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Problem 4: a) Four very large conducting planes, with charges per unit area - 0, +40, -20 and -30, respectively, are arranged
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28. 8=8.85481012 ♡ We know the electric field due to a electric field due to a infinite charged Sheet. 급 where of 6 = Charege

@ por For the point A. É - @ la -30 2% -6 +46 -26 for sheed with charege density - en uit te EL- 46 2£. (-) for charged plateconsider the point B he -30 Whene +6 -14 互 E - --] E2 AY 6 ”。 E2 二 X 2(X) E, E3 26 言: (9) 36 22。 目 - EL+E + F。 be B 36 28、 30consider t 30 2€ Ec 56 26. Teonsider ider the point D 6 2. . (-) -30 +48 -26 40 Ez ? (2) 2Eo Eu Ez E2 20 (-22) (4) 35 28 Ē TĒ(E) 36 28, (86 十 (26。 2 36。 26、 (國- 730 (26。 34 K. 6. 26。 | (.) = + (2) TE/6 28。 一

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