the Figure shows four charges at the corners of a square of side L. Assume q and Q are positive. What is the magnitude of the net Force on q?

Question

anonymous · Answer

attachment

anonymous · Answer

I know how to do the parts with -Q charges. I dont know how to get $$2\frac{ KQq }{ L ^{2} }$$ for q and 4Q , which is part of the answer.

kainui · Answer

Well, if you look at the formula, it looks like this:

$$F=K \frac{ q_1q_2 }{ r^2 }$$

list out what the magnitude of both charges is and the distance between the two charges like this:

q1=?
q2=?
r=?

and I'll help you out.

anonymous · Answer

It is only in terms of L, Q, q, and K. (looking for magnitude of force on charge q). See attached image for problem.

souvik · Answer

Kaimui told the required formula...
3 forces are acted on the charge q...one repulsive force by +4Q charge and two attractive force by two -Q charges...
you have to find these forces with direction..and add them using vector rules and find the magnitude of the net force..

anonymous · Answer

All I need is a step-by-step explanation on how to get the answer: $$(2-\sqrt{2})\frac{ KQq }{ L ^{2} }$$

kainui · Answer

A step-by-step explanation is what I'm trying to show you, but you didn't do like I asked you lol.