10 Electric FieldsP23.20(a)Ekqre==××=−29628 99 102 00 1011214 400...ejejafNCEx=0andEy=°=×2 14 40026 61 29 104bgsin..N CsoEj=×129 104.±NC .FIG. P23.20(b)FEjj==−××=−−q3 00 101 29 103 86 10642±.±ejNP23.21(a)Errriijj=++=+°+°+rrraaaee eeee11212222332322223245 045 04±±±±±cos.±sin.±Eij=+=°3065065912.±.±.aaaeat 58.8(b)°qae22. at58.8P23.22The electric field at any point xisExakq axe=−−=−afafchaf24.When xis much, much greater than a, we find Eakqxe≅43.P23.23(a)One of the charges creates at Pa field E=+kQnRxeat an angle θtothe x-axis as shown.When all the charges produce field, for n>1 , the componentsperpendicular to the x-axis add to zero.The total field is nk Q nkQxee±cos±ii32+=+.FIG. P23.23(b)A circle of charge corresponds to letting
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .