An infinitely long solenoid has a vacuum core. The solenoid has radius a, N turns per unit length, carrying current I(t). The I(1) is extremely slowly varying with time. А. State the magnetic field B...

Extracted text: An infinitely long solenoid has a vacuum core. The solenoid has radius a, N turns per unit length, carrying current I(t). The I(1) is extremely slowly varying with time. А. State the magnetic field B inside the solenoid. Derive the electric field E inside the solenoid. В. C. Determine the energy stored per unit length. Calculate the energy flux, o = fs. da. S is Poynting vector, and da is the D. infinitesimal area element. Е. Interpret the connection between 4.C and 4.D results.