Question

Use gauss law to derive the expression for the electric field ( ) due to a straight uniformly charged infinite line of charge density c/m.

Answer 1

hey...

gauss law states that the total electric flux through any closed surface is equal to 1/epsilonnot times of total charge enclosed by that closed surface placed in free surface.
for the straight uniformly charged infinite line we have to draw gaussian surface and it is cylinder

hope this helps u