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**1. Homework Statement**

The value of the Electric field at a distance of 82.8 m from a point charge is 75.3 N/C. Its direction is radially in toward the charge. The Coulomb constant is 8.98755 E9.

Find the magnitude and sign of the point charge at the origin. Answer in units C.

**2. Homework Equations**

I don't think I have all the necessary formulas. But this is what I do have

E=(KE*Q)/r^2 <---equation 1

F=[KE(Q1)(Q2)]/r^2 <--equation 2

**3. The Attempt at a Solution**

I am basically physics illiterate...so bare me some slack...

I used equation 1 to determine Q = 5.743E-5 .

How do I finish this problem? i feel like I'm missing a formula, or need some extra information.