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4. Consider two thin charged rods of length L carrying uniformity distributed charges of +q and -q positioned end-to-end as shown in the figure below. (a) Calculate the electric field at point P a distance x to right of where the rods meet. (b) Show that the approximate expression for the electric field at point P for x >>L looks like that of a dipole (Hint: Review Example 21.14 in your text). (o) what is the dipole moment of the charge distribution for x >> L and why does your answer make sense?
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Solution) This can be approximated to dipole containing equal and opposite charges separated by distance .

e clhu (x+ L) Net eledhie ted E E+ E have dipole Moment , p 29/L

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