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Khimraj
3007 Points
4 years ago
force on charge at C due to Charge at A and B
F1 = F2 =  F = 9*109*1*10-6*2*10-6/0.12 =1.8N
angle between F1 and F2 = 120
so resultant will be $\sqrt{F^{2} + F^{2} + F*Fcos120}$ =  F = 1.8N
Hope it clears.
Dr. Manvee Borah
12 Points
4 years ago
How can be the angle between   F1 and F2 =120, please explain i am not getting this step please help. Can you please provide a picture of it ?
Khimraj
3007 Points
4 years ago
I can’t upload picture but you can easily understand by imagine a triangle ABC
then force due to charge at A on charge at C is away along the line joining of point A to B and extend it
and force due to charge at B on charge at C is towarld along line joining of point C to B.
Hope it clears.