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What is the magnitude dBdBdB of the magnetic field contribution at point P, with coordinates (x,y)(x,y), due to the current element dl→dl→dl_vec at point A, with coordinates (a,0)(a,0)?

Express your answer in terms of some or all of the variables xxx, yyy, aaa, III, dldldl (the magnitude of dl→dl→dl_vec),

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