A uniformly charged, straight filament 6.55 m in length has a total positive cha

Question

A uniformly charged, straight filament 6.55 m in length has a total positive charge of 2.00 C. An uncharged cardboard cylinder 3.85 cm in length and 10.0 cm in radius surrounds the filament at its center, with the filament as the axis of the cylinder.

(a) Using reasonable approximations, find the electric field at the surface of the cylinder.
Just fill in the empty boxes

Just fill in the empty boxes

Substituting this value for lambda into the equation for the electric field obtained above, we obtain the magnitude of directed electric field at the surface of the cardboard cylinder.

Explanation / Answer

E = 2*Ke*lambda/r = 2*8.99*10^9*(2*10^-6/6.55)/0.1

= 5.49*10^4 N/C

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