29)
Example 2 5
(a) Determine the electrostatic potential energy of a system consisting
of  two charges 7 mC and –2 mC (and with no external field) placed
at (–9 cm, 0, 0) and (9 cm, 0, 0) respectively (b) How much work is required to separate the two charges infinitely
away from each other Rationalised 2023-24
Physics
60
 EXAMPLE 2