a. What is the inductance of a solenoid of radius r and length l ≫ r? Number
of turns per unit length of the solenoid n.
b. Obtain the formula for the inductance of the solenoid without neglecting
the effect of the electron mass me on the inductance. The wire cross-section
of the solenoid S, the number of conduction electrons per unit volume of the
conductor ne. Is it possible to ignore this effect on the inductance of coils used
in radio engineering?