Two point charges are placed in vacuum on a straight line 10\,cm apart. One charge is +2μC and the other is −3μC.
a. (i) Define electric potential at a point in an electric field and state its SI unit.
b. (ii) State, with reason, whether electric potential is a scalar or a vector quantity.
c. (iii) Calculate the electric potential at the midpoint of the line joining the two charges. Take k=9×109N m2C−2.
d. (iv) If the magnitudes of both charges are doubled while their separation remains the same, how will the answer obtained in part (iii) change? Give a brief justification.