Question

what ia the formula of solenoid

Answer 1

The formula is

Magnetic field = magnetic permeability * current *(Number of turns / Length of the solenoid)

The equation is:

B = μ I N/L

Where:

μ: permeability

B: magnetic field

I: current intensity flowing in the cable

N: number of turns of the wire

L: Length of the solenoid

Answer 2

For a solenoid of length L = m with N = turns, the turn density is n=N/L= turns/m