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An electron e is released from rest on the central axis of a uniformly charged disk of radius R. The surface charge density on the disk is...

An electron e is released from rest on the central axis of a uniformly charged disk of radius R.  The surface charge density on the disk is +4.0(10)^-6 C/m^2.  I need the magnitude of the electrons initial acceleration if it is released at distance:
(a) R
(b)R/100
(c)R/1000
from the center of the disk?
And why does the acceleration magnitude increase only slightly as the release point is moved closer to the disk?
Basically I need help in setting the problem up and step by step solutions,thank you.

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