,E  = 
0
2
r
ελ
π
Vectorially, E at any point is given by
0
ˆ
2
r
ελ
=
π
E
n
(1 32)
where ˆn  is the radial unit vector in the plane normal to the wire passing
through the point E is directed outward if l is positive and inward if l is
negative Note that when we write a vector A as a scalar multiplied by a unit
vector, i