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Two long charged, concentric cylinders have radii of 3.0 and 6.0 cm. The charge per unit length is 5.0 x 10^{-6}C/m on the inner cylinder and -7.0 x 10^{-6}on the outer cylinder. Find the electric field at (a) r = 3.0 cm and (b) r = 8.0 cm, where r is the radial distance from the common central axis.

2. Relevant equations

ε_{0}∮EdA = q_{enc}

λ= Q/L

3. The attempt at a solution

EA = q_{enc}/ε_{0}

E = λL/ π r^{2}ε_{0}

From here, I don't know what to do with L. The height of the cylinder should be irrelevant, right?

I have another similar question using ρ and volume, leaving me with a height in the formula for the volume that I don't know what to do with.

Thanks.

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# Homework Help: Gauss's Law

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