I thought this would be a basic physics problem, but I'm not getting the right answer, here's the problem:(adsbygoogle = window.adsbygoogle || []).push({});

There are two identical small metal spheres with charges 27.5 μC and −19.119 μC. The distance between them is 8 cm. The spheres are placed in contact then set at their original

distance. Calculate the magnitude of the force between the two spheres at the final position. The Coulomb constant is 8.98755 × 109 N · m^2/C2 .

Answer in units of N.

I used the formula, F=K*((q1*q2)/r^2)). I converted the charges using the 10^-6 conversion.

So, F=(8.98755*10^9)*(27.5*10^-6 * 19.119*10^-6) all over 0.08^2 and I got 738.3448 N.

The answer is incorrect according to the online service my class uses, what did I do wrong?

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

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!

# Coulomb's law and two spheres

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