posted by perfect .
A cylindrical capacitor is made of two thin-walled concentric cylinders. The inner cylinder has radius 4mm , and the outer one a radius 13mm . The common length of the cylinders is 153m . What is the potential energy stored in this capacitor when a potential difference 7V is applied between the inner and outer cylinder? (k =1/4∗π∗ϵ0=8.99×109N⋅m2/C2)
determine the capacitance from that.
Then, energy=1/2 C V^2