Two polystyrene balls, one has a charge twice the amount than the otherfind charges

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Homework Statement


Two balls of polystyrene foam are about 4 cm from each other and repel with an electric force of 0.2 N. Find the values of the two charges knowing that one of the balls has a charge that is twice the other.


Homework Equations


F= (kq1q2)/r2


The Attempt at a Solution


F= (k·Q·2Q)/r2
0,2 = ( 9x109·2Q2 ) / (0,04)2

Q= +1,77 x 10-14


AND its wrong! The right answers should be :
(+or-)188nC, (+or-)267nC
 
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