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Need help with Problem 1

## Homework Equations

E = kq/r

^{2}

V = -W/q

V = kq/r

## The Attempt at a Solution

1a. dE = kdq/rRSUP]2[/SUP]

dq = p ds

dE = kpds/R

^{2}

Not sure if I am right up to this point and don't know how to proceed.

1b. I think the electric field would be zero since the enclosed charge cancels out. Not sure on this either.

1c. V = kq/r so V = kZe/a

W = -kZ

^{2}e

^{2}/a

1d. Not sure how to approach

Any help would be appreciated!