Two point charges

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Two point charges,

q_1 = +4.0\,\mu\text{C}

and

q_2 = -3.0\,\mu\text{C}

, are fixed 0.20 m apart. A third charge

q_3 = +2.0\,\mu\text{C}

is brought from infinity to a point 0.10 m from

q_1

and 0.15 m from

q_2

. Calculate the change in the total electric potential energy of the system caused by adding

q_3