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Two point charges, q1 = 4.0×10^6 C and q2 = -1.0×10^6 C, are located on the x axis at x1 = -1.0 cm and x2 = 3.0 cm

Determine the electric field at the origin

I have no idea how to do this

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Two protons are separated by a distance of 1.0×10^10 m (roughly the diameter of an atom). Calculate the electric force and gravitational force on one proton due to the other proton. The electric force is much larger. What is the ratio of the electric force to the gravitational force?

I thought id find the electric force by:

F = [k(1.6 x 10^-19)(1.6 x 10^-19)] / (10^-20) = 2.304 x 10^-8

And find the gravitational force by:

F = [(g m1 m2) / (10^-20)] = 2/742 x 10^-33

I dont know if those are right, but even if they are i dont know how to format the answer

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I just need some thorough explination on these two questions, i got all my other ones done.

Thanks