(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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. Relevant 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.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Find the magnitude and sign of the point charge at the origin

**Physics Forums | Science Articles, Homework Help, Discussion**