Originally Posted by

**Xfd** Hi,

I am new to the forum as some of you will have noticed and I was quite impressed with what I have seen as lots of useful information can be found here.

Im not very good at Maths, Physics at all but was wondering if any of you could help me please, but only if you dont mind.

H1 FOE.jpg (Click link to view question)

In this question im guessing because the length between particle 1 and 2 is 9.00cm that particle 3 will have to be located above the two points giving an equilaterial triangle.

From this we know all the sides will be the same length of 9.00cm with an angle of 60 degrees. However, there is no solid value given for the charge on particle 1 and 2.

Since

Q1 has a charge of +Q

Q2 has a charge of +4.00Q

So does this mean that the above forumula has to be arranged somehow,

for F3,1 and F3,2 ?

Im not too sure, it would be helpful if someone could tell me what the correct formula is.

Thank you.