75. We take the current ( i =50A )toﬂowinth e + x direction, and the electron to be at a point P which is r =0 . 050mabov eth ew i r e(wh e r e“up”i sth e + y direction). Thus, the feld producedby the current points in the + z direction at P . Then, combining Eq. 30-6 with Eq. 29-2, we obtain ~ F e =( − eµ 0 i/ 2 πr )( ~v
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