A point charge of +2μC is fixed in vacuum. Point P is located 0.50m from this charge.
Answer the following questions:
a. (i) Calculate the electric potential at point P.
b. (ii) Determine the work that must be done by an external agent to bring a test charge of +3nC from infinity to point P without acceleration.
c. (iii) If the test charge in part (ii) is replaced by −3nC, what is the change (magnitude and sign) in the potential energy of the system? Explain the reason for the sign.