Question

What kind of magnetic field is produced by a current-carrying solenoid?

Answer 1

The magnetic influence on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field. In a magnetic field, a moving charge experiences a force that is perpendicular to both its velocity and the magnetic field.

Complete answer:
A solenoid is an electromagnet that uses a coil wound into a tightly packed helix to generate a controlled magnetic field. When an electric current is passed through the coil, it can be arranged to produce a uniform magnetic field in a volume of space. André-Marie Ampère coined the term solenoid to describe a helical coil in 1823.

The magnetic field inside an infinitely long solenoid is homogeneous, and the strength of the field is unaffected by the distance from the axis or the cross-sectional area of the solenoid.A solenoid is a wire coil that generates a strong magnetic field inside it. The magnetic field created by wrapping the same wire around a cylinder many times can be quite strong. The number of loops in the solenoid is represented by the number of turns N. A stronger magnetic field will result from more loops.

The field inside the solenoid has the following formula:
$\text{B }=~\dfrac{{{\mu }_{0~}}I\text{ }N\text{ }}{L}$
The applied current and the number of turns per unit length are proportional to the magnetic field inside a solenoid. The field strength is independent of the solenoid's diameter, and the field strength is independent of the position inside the solenoid, i.e. the field inside the solenoid is constant.

Thus, inside a current-carrying solenoid, the magnetic field is very uniform in both direction and magnitude. It begins to weaken and change direction only near the ends.

Note: The length of an infinite solenoid is infinite, but the diameter is finite. "Continuous" means that the solenoid is made up of many infinitely thin coils with no space between them, rather than discrete finite-width coils; in this abstraction, the solenoid is often viewed as a cylindrical sheet of conductive material.