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Unformatted text preview: -6 m, and r = 3.63 cm. Chapter 22, Problem 26 In Fig. 22-45, a thin glass rod forms a semicircle of radius r = 3.97 cm. Charge is uniformly distributed along the rod, with + q = 5.45 pC in the upper half and -q = -5.45 pC in the lower half. What is the magnitude of the electric field at P , the center of the semicircle? Chapter 22, Problem 37 Suppose you design an apparatus in which a uniformly charged disk of radius R is to produce an electric field. The field magnitude is most important along the central perpendicular axis of the disk, at a point P at distance 3.70 R from the disk (Fig. 22-52 a ). Cost analysis suggests that you switch to a ring of the same outer radius R but with inner radius R /3.70 (Fig. 22-52 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 ?...
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This note was uploaded on 02/07/2011 for the course PHY 21 taught by Professor Hickman during the Spring '08 term at Lehigh University .
- Spring '08