P23_055 - 55. A small section of the distribution has...

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55. A small section of the distribution has charge dq is λdx ,where λ =9 . 0 × 10 9 C/m. Its contribution to the Feld at x P =4 . 0mis d ~ E = dq 4 πε 0 ( x x P ) 2 pointing in the + x direction. Thus, we have ~ E = Z 3 . 0m 0 4 0 ( x x P ) 2 ˆ i which becomes, using the substitution u = x
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