(Solved): 4.A cylindrical cell made by a metal has an inner radius \( a \) and an outer radius \( b \) and an ...

4.A cylindrical cell made by a metal has an inner radius \( a \) and an outer radius \( b \) and an infinite axial length. The cylinder carries an electric charge \( \lambda_{0} \) per unit length along its axis. Find the 1 electric field and the potential in whole space if we consider as a potential reference the surface with radius \( r=2 b \).