Three charges +q, +q and -2q are placed at the vertices of an equilareral triagle. What is the dipole moment of the system?

Consider the charges q, q and -q placed at the vertices of an equilateral triangle as shown in Fig. What is the force on each charge ?

Three charges, q each, are placed at the vertices of an equilateral triangle. What will be the resultant force on charges Q placed at the centroid of the triangle?

Consider the charges q,q and -q placed at the vertices of an equilateral triangle of each side l. What is the force on each charge ?

Consider the charges q,q and -q placed at the vertices of an equilateral triangle of each side l. What is the force on each charge ?