Electrostatics

1. The problem statement, all variables and given/known data
We have a charged straight wire with radius ra = 0.2 cm and with charge ta = 3nanoC/m. Around the wire there are two hollow concentric cylinders, so that the wire is in their axis. Let the charge on the first cylinder be of radius rb = 3cm and its charge tb = -1.5nC/m and on the second cylinder with rc = 5cm with charge tc = 2 NC / m What is the force on the charge Q =-5NC in the distances
R = 0.8 cm,
R = 2.5 cm,
R = 100 cm?

I do not have the slightest idea what to do. I do not want you to compute it for me but give samo advice, please.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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