Physics – 4.5.3 Magnetic effect of a current | e-Consult

The strength of the magnetic field inside a solenoid increases as the distance from the centre of the solenoid increases, up to a certain point.

The magnetic field lines inside a solenoid are approximately parallel and evenly spaced. The magnetic field strength is proportional to the current and the number of turns per unit length. As you move further from the centre, the magnetic field lines become less concentrated, but the field strength remains relatively constant for a significant distance. However, the field strength will eventually decrease as you move too far from the solenoid, as the field lines spread out.