Solve the all parts of given question:
Question: A cylindrical capacitor consists of a long wire of radius R1 and length L with a charge +Q and a concentric outer cylindrical shell of radius R2, length L and charge -Q.
Part A: Find the electric field magnitude and energy density everywhere.
Part B: Derive an expression for the energy stored in a cylindrical shell of thickness dr at a point between the conductors.
Part C: Integrate your expression from R1 to R2 to find the total energy stored in the capacitor.
I need help to find the total energy stored in the capacitor.