In the same manner, electric field E2 at r due to q2 at
r2 is
E2 = 
41
0
2
2
2
πε
q
r P
2P
ˆr
where 
ˆr2P
 is a unit vector in the direction from q2 to P
and r2P is the distance between q2 and P Similar
expressions hold good for fields E3, E4, , En due to
charges q3, q4, , qn