Solenoid magnetic field energy
$$W = \frac{B^{2}\cdot V}{2\cdot \mu\cdot \mu0}$$
W - magnetic field energy
B - magnetic induction
V - bulk (volume)
μ - relative magnetic permeability
μ0 - magnetic constant
B - magnetic induction
V - bulk (volume)
μ - relative magnetic permeability
μ0 - magnetic constant
Find
It is known that:
= 