Positive charge Q is distributed uniformly along the x-axis from x = 0 to x = a. A positive point charge q is located on the positive x-axis at x = a + r, a distance, to the right of the end of Q (Fig. 21.47). (a) Calculate the x- and y-components of the electric field produced by the charge distribution Q at points on the positive x-axis where x> a. (b) Calculate the force (magnitude and direction) that the charge distribution Q exerts on q. (c) Show that if r » 0, the magnitude of the force in part (b) is approximately Qq/πє0r2. Explain why this result is obtained.

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