Four identical point charges +q are fixed at the corners of a square of side 0.20m kept in air.
a. (i) Obtain an expression for the electric potential at the centre of the square in terms of q and the side a.
b. (ii) Calculate the numerical value of the potential at the centre when q=5μC.
c. (iii) How much work has to be done in bringing a point charge −2μC from infinity to the centre of the square? State the sign of the work.