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

There is an equilateral triangle with one point charge at each vertex. The point charges have charges of +Q, +2Q, and -4Q. The length of one side of the triangle is L. Determine an expression in simplest form for the voltage at a point halfway between the +Q and +2Q point charges.

2. Relevant equations

V=kQ/r

V_{net}=V_{1}+V_{2}+V_{3}

3. The attempt at a solution

Going off of V_{net}=V_{1}+V_{2}+V_{3}:

V_{net}= (kQ/r) + (k2Q/r) - (k4Q/r)

I think once substituting the values for L in place of r, you get:

V_{net}= (kQ/(L/2)) + (k2Q/(L/2)) - (k4Q/Lcos30)

Am I heading in the right direction?

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# Homework Help: Voltage and point charge

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