Question 15

Three positive charges of equal value $$q$$ are placed at vertices of an equilateral triangle. The resulting lines of force should be sketched as in

Solution

Place a sample unit charge on the plane of these charges and see how it behaves under the electric field lines from the 3 charges placed on the surface ,electric field lines originated from charge of same sign never meet each other and will always tend to never meet and flow out from each other.
Here only option C is having all these requirements