Q4

A very long solenoid having n turns per unit length has radius a. The permeability of the core is . If the magnetic energy density inside of

the solenoid is (un²/2), determine the stored magnetic energy per unit length of the solenoid. (Approx. 5 min.)

ooooooo

un²12²πa²/4

None of them.

u²n² 1²πa²/2

нп2 1 па2

un²²πa³/3

u² n² 1² m² a²/2

μn/ma/2

μ²n² 1²πa²/4

HN2 12 пLa2/2