Electrostatic force and magnitude problem

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loganblacke
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In the figure, the net electrostatic force on Q1 is zero. If Q1 = +4.99 nC, determine the magnitude of Qo.


Qo = (r0/r1)^2 * abs(q)*2cos theta

The figure is attached, please help, I'm so lost with physics II
 

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hi loganblacke! :smile:

(have a theta: θ and try using the X2 icon just above the Reply box :wink:)

forces are vectors, so you have to add them as vectors

start by writing out the three forces as three vectors :smile:
 
How do i determine the direction of the vectors?