(Solved):   (a) Derive an expression for the electric potential \( V \) created by a positive point ch ...

 

(a) Derive an expression for the electric potential \( V \) created by a positive point charge at any distance \( r \) from the charge. (b) Sketch the variation of electric potential \( V \) from a positive point charge as a function of distance \( r \) from the charge.