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Your two group members in recitation show you their solution to a problem they are working on but cant seem to get the right answer: What is the horizontal component of the electric field due to a uniform line of charge (length L, charge per length X) at a point a distance d from the left edge of the rod and a height h above the line of the rod? You look at their diagram and then study their solution. After pointing out that they should explain their reasoning for each step, you tell them that they first introduced their error in step number kd kadr (3)dE = kAdx (4)dE kAdx

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dl dえ 2-

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