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80. An infinitely long nonconducting solid cylinder of radius R has
a nonuniform but cylindrically symmetrical charge distribution.
The volume charge density is given by p(r) = c/r, where cis a
positive constant having units C/m and ris the radial distance
from the long central axis of the cylinder. (a) What is the charge
in a section of the cylinder of length €? Write an expression for
the electric field magnitude for (b) r<Rand (c) r> R.

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