If the number of turns of a solenoid is doubled, keeping the other factors constant, how does the magnetic field at the axis of the solenoid change?

If the total number of turns of solenoid is doubled, and simultaneously the length of the solenoid is doubled, then the magnetic field inside the solenoid is also doubled. Is this statement true.

When the number of turns and length of a solenoid are doubled keeping the area of cross-section same, the inductance.