Rationalised 2023-24
Physics
60
 EXAMPLE 2 5
(c) Suppose that the same system of charges is now placed in an
external electric field E = A (1/r 2); A = 9 × 105 NC–1 m2 What would
the electrostatic energy of the configuration be Solution
(a)
12
9
1
2
0
1
7
( 2)
10
9
10
4
0