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A thin rod of length L=80 cm carries a total charge of +5 nC uniformly distributed...

A thin rod of length L=80 cm carries a total charge of +5 nC uniformly distributed over its left half and -5 nC over its right half. Find the electric field on the axis of the rod at distance r=400 cm from its rightmost end. What is the magnitude of the electric field at point P. (N/C)?

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