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The Electric field at x3 is
=9x10^9 *(-15.0x10^-9/0.585^2 - 32.5x10^-9/1.13^2)
=9(-15/0.585^2-32.5/1.13^2) = -623.5 N/C
F= 55.0 x10^-9*(-623.5) = -3.43x10^-5 N
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