Magnetic induction of solenoid
$$B = \frac{\mu\cdot \mu0\cdot N\cdot I}{l}$$
B - magnetic induction
μ - relative magnetic permeability
μ0 - magnetic constant
N - number of turns in a winding
I - current intensity
l - length of solenoid
μ - relative magnetic permeability
μ0 - magnetic constant
N - number of turns in a winding
I - current intensity
l - length of solenoid
Find
It is known that:
= 