A point charge of +6.0μC is fixed in air at a point O.
a. (i) Calculate the electric potential at a point P located 0.30m from O.
b. (ii) Determine the electric potential at another point Q that is 0.60m from O.
c. (iii) A test charge of 2.0nC is moved from Q to P. Find the work done by an external agent in performing this transfer.