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April 23, 2014

Homework Help: Physics 1

Posted by Beth on Saturday, June 9, 2012 at 10:37pm.

Three charges are fixed to an xy coordinate system. A charge of +16C is on the y axis at y = +3.1 m. A charge of -16C is at the origin. Lastly, a charge of +55C is on the x axis at x = +3.1 m. Determine (a) the magnitude and (b) direction of the net electrostatic force on the charge at x = +3.1 m. Specify the direction as a positive angle relative to the +x axis.

I figured out how to set up the problem in general, but i keep getting the wrong answer. Please help!
So this is what I have gotten so far. I dont understand how to get the direction at all.

(9x10^-9)* (((18x10^-6)(55x10^-6))/ 3.1^2+3.1^2= 0.46357

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