Question

The magnetic flux density in a solenoid increases with more turns
True or False

Answer 1

The magnetic field inside a solenoid is (using Ampere's Law):
$$
\vec{B}=\mu_oLnI
$$
Where \(\mu_o\) is the magnetic permeability of free-space (assuming air core), \(L\) is the length of the solenoid, \(n\) is the number of turns and \(I\) is the current through the coil: