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Unformatted text preview: Problem 5.7 A circular loop of line charge. From Problem 5.6 (see your notes for Demo 3), a charge q next to a dielectric medium of permittivity produces an image charge of-q - + . From this, you should deduce that the loop with a charge density of + will have an image loop with a charge density of- - + . By symmetry, the electric eld will have only a z component at the point P due to the two loops of charge: E z = 2 a 4 [( d-L/ 2) 2 + a 2 ] d-L/ 2 p ( d-L/ 2) 2 + a 2- - + 2 a 4 [( d + L/ 2) 2 + a 2 ] d + L/ 2 p ( d + L/ 2) 2 + a 2 CORNELL UNIVERSITY c WES SWARTZ (09/8/29) 31...
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