Question

Identify regions of different magnetic field strength around a solenoid

Answer 1

Solenoid consists of a length of insulated wire coiled into a cylinder shape.

Current in solenoid produces a stronger magnetic field inside the solenoid than outside. The field lines in this region are parallel and closely spaced showing the field is highly uniform in strength and direction.
Field lines outside the solenoid are similar to that of a bar magnet, and it behaves in a similar way – as if it had a north pole at one end and south pole at the other end. Strength of the field diminishes with distance from the solenoid.
Strength of the magnetic field can be increased by:
increasing the current in the coil
increasing the number of coils in the solenoid; and
using a soft iron core within the solenoid.