An equilateral triangle with sides 66 m has charges +5 [tex] \mu C [/tex], -5 [tex] \mu C [/tex], and -9.3 [tex] \mu C [/tex] at its vertices and charge + 18.6 [tex] \mu C [/tex] at the midpoint on its side between the vertices with charges [tex] +5 and -5 \mu C [/tex]. What is the magnitude of the x-component of the electric field at point P, the point forming a second equilateral triangle with +5 [tex] \mu C and -5 \mu C [/tex]? Answer in units of N/C.(adsbygoogle = window.adsbygoogle || []).push({});

Sorry I don't have a picture but it's 2 equilateral triangles that look like a mirror image of each other.

First I drew a picture of what the electric fields would look like. The -9.3 and 18.6 [tex]\mu C [/tex] would not have a y-component, so I ignored those for now.

so I found that

k * 5 x 10^-6/ 66^2 * 33/66 = 5.17

and k * -5 x 10^-6 / 66^2 *57.2/66 = 8.95 (since it's absolute value of the charge)

So E_x= 14.12... which isn't right.. help please?

**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: Electric field problem

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