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## Homework Statement

An isolated cylindrical capacitor consists of two concentric conducting cylinders of length L and radii a and b. The inner and outer conductors carry +Q and -Q, respectively.

a. Determine the electric field between the conductors.

b. Determine the electric potential difference between the two conductors.

c. What is the capacitance of this device?

## Homework Equations

V=[tex]\int[/tex]E dL

[tex]\oint[/tex]E dA=Q/Epsilon

C=Q/V

## The Attempt at a Solution

a. I got as my answer E=Q/(2[tex]\pi[/tex]Epsilon not (aL))

b. I used the integral with V and got Q/(2[tex]\pi[/tex]Epsilon not (a) (ln(b/a))

c. I plugged my answer from b into C=Q/V and got ln(b/a)/(2[tex]\pi[/tex]Epsilon not (a))

I am not sure if I did any of these right...