(21-40) Two parallel circular rings of radius R have their centers on the x axis separated by a dist

(21-40) Two parallel circular rings of radius R have their centers on the x axis separated by a distance l as shown in Fig. 21-60. If each ring carries a uniformly distributed charge Q, find the electric field, E(x), at points along the x axis.

[cisrs]

E left is wrong it must be (l/2 - x ) not (x - l/2) distance can not be neg.