# Physics

posted by
**Prathiksha**
.

Three point charges + q, -q and + q are placed at the vertices P, Q and R of an equilateral triangle. If F=1/4ðE q 2/ r2 where r is the side of the triangle, What is the force on charge at P due to charges at Q and R? It is along which direction.?

Since one charge is +ve other -ve will they cancel each other. Or to find out the total effect should i add the forces. Since force is a vector it will be along which direction along +ve or -ve x axis? How to calculate in the above question.