Question 1 Three point charges are arranged as shown in the figure. IfQ - 80 .C, a - 3.0m, and
b - 4.0 m. Find:

a) The magnitude and direction of the electric field at point P.
b) The electric potential due to these three charges at point P.
c) The change in electric potential energy (in units of joules and ov) of
the system of these three charges plus a fourth point charge of $ nC
as this fourth charge moves from infinity to point P.