Arturo O. answered • 04/13/17

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The net force is zero, because the proton is exactly in the middle of 3 pairs of electrons, with the electrons of each pair applying equal but opposite attractive forces on the proton. You cannot just say that the field is 6 (KQ/r

^{2}), because the forces from the 6 electrons are not all along the same direction.The above is an intuitive argument. If you need a mathematical solution, then you would have to project the electric fields or forces due to the 6 electrons along on the x and y axes, add up algebraically the contributions from the 6, and see that the net x and y components are both zero. But that is a tedious calculation.