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RhysticGenesis

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**uniform linear charges and plane charges and mastering physics??**

I am completely stumped on this mastering physics problem, problem 22.34 (same as out of the university physics volume 3 11th edition book) and I cannot find any examples to compare to in my physics book and I have tried multiple times to come up with some solution but none make sense, I was hoping someone could point me in the right direction or show me how to go about solving it.

the problem is:

A long line carrying a uniform linear charge density 50 mu[micro] C/m [So 50*10^-6 ; sorry don't know how to make mu character so just clarifying] runs parallel to and 10.0 cm from the surface of a large, flat plastic sheet that has a uniform surface charge density of -100 mu [micro] C/m^2 on one side.

Find the location of all points where an alpha particle would feel no force due to this arrangement of charged objects.

as I said before I am completely stumped and I have failed attempts about 5 -6 times and I would appreciate any help given. Thanks in advance