일반물리학 2 — Induction and Inductance: Problem 29

29 A solenoid that is 85.0 cm long has a cross-sectional area of 17.0 cm2. There are 1210 turns of wire carrying a current of 6.60 A. (a) Calculate the energy density of the magnetic field inside the solenoid. (b) Find the total energy stored in the magnetic field there (neglect end effects).