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[" 76.Two long parallel (c) "(mu(0)I)/(2...

[" 76.Two long parallel (c) "(mu_(0)I)/(2 pi R)" (d) "(mu_(1)R_(13))/(4 pi R)],[" carry steady equal curres are at a distance "2 pi R],[" paper as shown.The variation out of the apart They "],[" along the line "XX'" is given by "],[[" (a) "x-," B fiven by "],[,quad vdots d],[,quad quad vdots],[," (b) "x-(1)/(2)d]]

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