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A 13 cm piece of nylon string lies along the x x -axis, starting at x=0...

A 13 cm piece of nylon string lies along the x x -axis, starting at x=0 x = 0 cm. The first 5 cm of the string has a charge density of -9 μ μ C/cm, and the remaining length of the string has a charge density of -7 μ μ C/cm. What is the x x -component of the total electric field at the position x=18 x = 18 cm?

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