- #1
Kaleem
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Homework Statement
Consider a long, cylindrical charge distribution of radius R with uniform charge density ρ.
a) Using Gauss’s law, find the electric field at distance r from the axis, where r < R
b) Using Gauss’s law, find the electric field at distance r from the axis, where r > R
Homework Equations
∫EdA = Qinside/ε0
q = ρV
V = πr2L
A = 2πrL
The Attempt at a Solution
I've successfully solved the first part which is E = ρr/2ε0.
However for the second part I am confused as to whether or not I would need to use big R for the area, because we are now going at a distance out of the surface or to use little r.