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Properties of Charges

All four char...

Question

All four charges in figure have the same magnitude. At point P,the electric field produced by these charge is directed toward the left. Charge $q_{1}$ is negative. What are the signs of $q_{2}, q_{3}, q_{4}$ ?

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Solution

Electric field lines go from positive to negative charge.
As there is no electric field component in the vertical direction,it follows that $q_{3}$ is also negative,so that vertical electric field component cancel out.
Since the electric field is towards the left,it follows that $q_{4}$ is positive and $q_{2}$ is negative since electric field lines flow from positive to negative charges.

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