P24_035 - r is the distance from the center of the sphere...

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35. Charge is distributed uniformly over the surface of the sphere and the electric Feld it produces at points outside the sphere is like the Feld of a point particle with charge equal to the net charge on the sphere. That is, the magnitude of the Feld is given by E = q/ 4 πε 0 r 2 ,where q isthemagn itudeo
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Unformatted text preview: r is the distance from the center of the sphere to the point where the Feld is measured. Thus, q = 4 r 2 E = (0 . 15 m) 2 (3 . 10 3 N / C) 8 . 99 10 9 N m 2 / C 2 = 7 . 5 10 9 C . The Feld points inward, toward the sphere center, so the charge is negative: 7 . 5 10 9 C....
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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