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Please I need help with the solution to the B part of the question

In the figure an electron (e) is to be released from rest on the central axis of a uniformly charged disk of radius R. The surface charge
density on the disk is +4.04 µC/m². What is the magnitude of the electron's initial acceleration if it is released at a distance (a) R, (b)
R/144, and (c) R/1020 from the center of the disk?

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