Positive point-charges of +16.0 mC are fixed at two of the vertices of an equilateral triangle with sides of 1.30 m, located in vacuum. Determine the magnitude of the E-field at the third vertex.(adsbygoogle = window.adsbygoogle || []).push({});

so...all the particals are in equalibrum so that means F=ma=0

so if i call the third vertex c...Ea+Eb+Ec=0 so that means that Ea+Eb=-Ec

now i can write kqa/r^2+kqb/r^2=Ec and i just have to solve for Ec right?

**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!

# Homework Help: Charges on the vertex of a triangle

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