Chapter 21.5, Problem 21.5TYU

Suppose that the line of charge in Fig. 21.24 (Example 21.10) had charge +Q distributed uniformly between y = 0 and y = +a and had charge −Q distributed uniformly between y = 0 and y = −a. In this situation, the electric field at P would be (i) in the positive x-direction; (ii) in the negative x-direction; (iii) in the positive y-direction; (iv) in the negative y-direction; (v) zero; (vi) none of these.