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2015-02-03T14:41:30+05:30

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See the diagram. 
the force acting on charge at B due to charge at A is
F_1= \frac{1}{4 \pi \epsilon_0}  \frac{q_1q_2}{r^2} =9*10^9* \frac{(2*10^6)^2}{4^2}=2.25*10^{21}N
It acts in the direction from A to B.

the force acting on charge at B due to charge at C is
F_2= \frac{1}{4 \pi \epsilon_0} \frac{q_1q_2}{r^2} =9*10^9* \frac{(2*10^6)^2}{3^2}=4*10^{21}N
It acts in the direction from C to B.

Since F₁ and F₂ are at right angles to each other, the resultant F is given by

F= \sqrt{F_1^2+F_2^2}\\F = \sqrt{(2.25*10^{21})^2+(4*10^{21})^2} \\F= \sqrt{21.0625*10^{42}} \\F=\boxed{4.59*10^{21}\ N}
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Hey your answer is absolutely Wrong
why is it wrong?
sorry i forgot the diagram...
OK I will check and Say. Any Way thanks