1. The problem statement, all variables and given/known data A cylindrical shell of radius 7.00 cm and length 240 cm has its charge uniformly distributed on its curved surface. The magnitude of the electric field at a point 19.0 cm ra- dially outward from its axis (measured from the midpoint of the shell) is 36.0 kN/C. Use approximate relationships to find (a) the net charge on the shell and (b) the electric field at a point 4.00 cm from the axis, measured radially outward from the midpoint of the shell. 2. Relevant equations 3. The attempt at a solution Could someone please explain to me why this does not work: Flux = Q/e = E*2pi*r*l Where I am thinking of Q in terms of an average AREA charge density * the area, and not a line density * a length. -- Is it because it lacks enough independent equations?