I already found Part 1 to be 113 N m^2/C. I just need help with Part 2. A unifor

Question

I already found Part 1 to be 113 N m^2/C.

I just need help with Part 2.

A uniformly charged, straight filament 10 m in length has a total positive charge of 1 mu C. An uncharged cardboard cylinder 1 cm in length and 9 cm in radius surrounds the filament using the filament as its axis of symmetry, with the filament as the central axis of the cylinder. Find the total electric flux through the cylinder. The permittivity of free space is 8.8542 Times 10^-12 C^2/N. m^2. Answer in units of N. m^2/C. What is the electric field at the surface of the cylinder? Answer in units of V/m.

Explanation / Answer

Part 1) 1 * 10 ^ -6 * 0.01 m / 8.852 * 10 ^ -12 * 10 m = 113.0 N m^2/C. ==========answer)

Part 2) E =113.0 N m^2/C / 2 * 3.14 * 0.09 m * 0.01 m = 20000 V/m =======answer)

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