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WardenOfTheMint
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Homework Statement
Four point charges are situated at the corners of a square with sides of length a.
Find the resultant force on the positive charge q. HINT: write an expression for the resultant force, use Ke for Ke, q for q, and a for a! That makes sense, because not much information is given.
HERE is a picture.
Homework Equations
F=Ke ( q1q2 / m^2 )
Ke is the constant 8.99e9 Nm^2/C^2.
Q1 and Q2 are any two charges of interest. That m^2 basically means the distance between two should be charges squared. So if distance between two charges is 5 cm, then it should be (0.05m)^2.
The Attempt at a Solution
F of top left negative charge on positive charge = Ke ( q^2 / a^2 ) ?
F of top right negative charge on positive charge =Ke ( q^2 / ( (2sqrt(a))^2 ) ?
F of bottom right negative charge on positive charge = Ke ( q^2 / a^2 ) ?
I don't know what I'm doing.
I figured that if you make a 45 45 90 triangle out of that square, the length between the positive charge and the top right charge should be 2sqrt(a). Other than that I do not know.