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Chapter 22, Problem 037 Suppose you design an apparat s in which a uniform y charged diska radius R s to produce an elect c a The fidd magnitude s most i partant along the central perpendicular a s of the disk at a point p at distance 3 R o the disk see F gure 큐 Cost analysis suggests that you switch to a ring of the same outer radius R but with inner radius R/3.60 (see Figure (b Assume that the ring will have the same surface charge density as the original disk. If you switch to the ring, by what part will you decrease the electric field magnitude at P? t aing of tesne ring will hat the electric fet Numbar the toierancers +/ 5%

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2 olis 3-6 13.16 R 3.6RotivR ei 1-3-R 6)2 12.91 -- Qi pi Ri- = o.oo29チkar

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