Solenoid magnetic field energy
$$W = \frac{\mu\cdot \mu0\cdot S\cdot N^{2}\cdot l^{2}}{2\cdot l}$$
W - magnetic field energy
μ - relative magnetic permeability
μ0 - magnetic constant
S - cross-sectional area
N - number of turns in a winding
l - length of solenoid
I - current intensity
μ - relative magnetic permeability
μ0 - magnetic constant
S - cross-sectional area
N - number of turns in a winding
l - length of solenoid
I - current intensity
Find
It is known that:
= 