A charge of +3.00 µC is placed at the point (0 m, 0 m, 0 m); a charge of -4.50 µC is placed at the point (2.00 m, -5.00 m, 7.00 m); finally, a charge of -1.00 µC is placed at the point (1.00 m, 1.00 m, 1.00 m).

(a) What is the electric potential energy of this configuration?

(b) If a neutron (a particle with the mass of the proton but no electric charge) is brought in from infinity and placed at the point (-3.00 m, 2.00 m, 5.50 m), how does the electric potential energy of the configuration change?