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83. A small section of the distribution that has charge dq is λ dx , where λ = 9.0 × 10 –9 C/m. Its contribution to the field at x P = 4.0 m is dE dq xx P G = − 4 0 2 π ε bg pointing in the + x direction. Thus, we have () 3.0m 2 0 0 ˆ i 4 P dx E = − ∫ G λ π which becomes, using the substitution
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