Energy Stored in Different Coils#

Solenoid $$A$$ is tightly wound while solenoid $$B$$ has windings that are evenly spaced with a gap equal to $${\rm {{ params.num }}} d$$, where $$d$$ is the diameter of the wire. The solenoids are otherwise identical.

Question Text#

Determine the ratio of the energies stored per unit length of these solenoids when the same current flows through each.

$$E_B/E_A =$$ .