Compute all parts of given question:
Question: You would like to store 8.5J of energy in the magnetic field of a solenoid. The solenoid has 630 circular turns of diameter 7.2cm distributed uniformly along its 25cm length.
Part I: How much current is needed?
Part II: What is the magnitude of the magnetic field inside the solenoid?
Part III: What is the energy density (energy/volume) inside the solenoid?
Any help I can get on this question is greatly appreciated! I'm not too familiar with this question.