A cylindrical capacitor is made of two thin-walled concentri…

A cylindricаl cаpаcitоr is made оf twо thin-walled concentric cylinders. The inner cylinder has radius  =  4.0 mm, and the outer one a radius =  8.0 mm. The common length of the cylinders is L =  150 m.  What is the potential energy stored in this capacitor when a potential difference 4.0 V is applied between the inner and outer cylinder?