'Infinitesimal length dx' presentation slideshows

An infinitesimal length dx of rod has dq= ?dx of charge, where ?=Q/L.

A thin rod of length L with total charge Q lies along the x-axis as shown. Find the magnitude and direction of the electric field at P, a distance y from the rod and along the perpendicular bisector of the rod. An infinitesimal length dx of rod has dq= ?dx of charge, where ?=Q/L. y.

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