As shown in the figure, charges `+q and -q` are placed at the vertices `B` and `C` of an isoscles triangle. The potential at the vertex `A` is

As shown in the figure, charges and are placed at the vertices and of an isosceles triangle. The potential at the vertex A is

If the charges +Q and -Q are placed at the two vertices of an equilateral triangle of side l, then potential at the third vertex is

Two point charges +q and -2q are placed at the vertices B and C of an equilateral triangle ABC of side a as given in the figure. Obtain the expression for (i) The magnitude and (ii) the direction of the resultant electric field at the vertex A due to these two charges.

Two point charges +6q and -8q are placed at the vertices B and C of an equilateral triangle ABC of side a. Obtain an expression for magnitude and direction of resultant electric field at the vertex A due to these two charges.