Here,
p =10–5 C × 5 × 10–3 m  = 5 × 10–8 C m
Therefore,
E  =
8
12
2
1
2
2
5 10
C m
4 (8 854 10
C N
m
)
−
−
−
−
×
×
π
×
3
6
3
1
(15)
10
m
−
×
×
 = 2 6 × 105  N C–1
along the dipole moment direction AB, which is close to the result
obtained earlier (b) Field at Q due to charge + 10 mC at B
=
5
12
2
1
2
10
C
4
(8