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## Homework Statement

http://imgur.com/fvNbE

Part a needs to have up to 2 significant figures.

For part b. you need to find theta or the degrees counter clockwise from +x direction.

## Homework Equations

Coulombs Law:

F = 9(10^9) |q1q2|/r^2

r = distance in meters of two charges

## The Attempt at a Solution

Part A.

F(Q on q1) = 9(10^9) N*m^2/C^2 * (2*10^-6 C)(4*10^-6 C) / (0.5m)^2

= 0.288 N

F(q2 on q1) = 9(10^9) N*m^2/C^2 * (2*10^-6)^2 / (0.60m)^2

= 0.1 N

|F| = sqroot( (0.288 N)^2 + (0.1 N)^2 ) = 0.304867 N *I know this is wrong because I tried to submit this answer and it was no go.*

Part B.

atan(0.1 N/0.288 N) = 19.148 degress

180 - 19.148 = 160.852 degress

*For this part I figured I take 180 and subtract the degrees obtained to get the degrees counter clockwise of the +x direction.