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A thin straight rod of length 2a carryi...

A thin straight rod of length `2a` carrying a uniformly distributed charge `q` is located in vacumm. Find the magnitude of the electric field strength as a function of the distatance `r` from the rod's centre along the streaight line
(a) perpendicular to the rod and passing through its centre ,
(b) coinciding with the rod's direction (at the point lying outside the rod).

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