ch23-p057 - 57. (a) Since the volume contained within a...

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(b) At r = R /2, the magnitude of the field is 22 00 /8 1 4( / 2 ) 2 4 QQ E R R πε == and is equivalent to half the field at the surface. Thus, the ratio is 0.500. 57. (a) Since the volume contained within a radius of
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