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Electric field of three charges

Refer to three charges shown & arranged in attached picture file:

What is the magnitude and direction of the force on the - 3.25 mC charge?
What is the magnitude and direction of the electric field at point x?

See attached file for full problem description.

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The electric field of a point or an exactly spherical charge Q at displacement r(vector) from it is

E(vector) = Q/(4 pi e_0) r(vector) / r^2

that is it is directed away from the charge if Q is positive and towards the charge if Q is negative, and its magnitude is

|E| = |Q|/(4 pi e_0 |r|),

where e_0 ~= 8.85x10^{-12} F/m is the electric permeability of vacuum.

Let us calculate the fields of charges +3.00 microC ...

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