The strength of the magnetic field inside a long current carrying a straight solenoid is:

The strength of the magnetic field inside a long current carrying a straight solenoid is the same at all points 

A solenoid is a coil of wire designed to create a strong magnetic field inside the coil. By wrapping the same wire many times around a cylinder, the magnetic field due to the wires can become quite strong. The number of turns refers to the number of loops the solenoid has. More loops will bring about a stronger magnetic field.

The magnetic field inside a solenoid is proportional to both the applied current and the number of turns per unit length. There is no dependence on the diameter of the solenoid, and the field strength doesn't depend on the position inside the solenoid, i.e., the field inside is constant.

The magnetic field is a nearly uniform field in the center, i.e. inside of a long solenoid and the field outside is weak and divergent.