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Problem 21.50 Part A A point charge -2Q is at the center of a spherical shell of radius R carrying charge spread uniformly over its surface. What is the electric field at r- R? Express your answer in terms of Q, R and constant k Submit My Answers Give Up ncorrect; Try Again; 2 attempts remaining The correct answer involves the variable Q. which was not part of your answer. Part B What is the electric field at r 2R? Express your answer in terms of Q, R and constant k E2 Submit My Answers Give Up

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a) from the Gausss law, E.ds - Lenelosed E(47r)-20 The electric field is, 4T -8Q 8Qk b) Again using the Gausss law, E.ds-le-O -o 47 (2R) ε。 -9 Qk 47

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