Inside a current-carrying long solenoid, magnetic field lines have the shape of

Inside a solenoid, the magnetic field lines are in the shape of parallel straight lines. As a result, Option 4 is right.

The intensity of the magnetic field is the same at all sites in this arrangement of field lines inside the solenoid.

A magnetic field is created as current travels through the wires.

The solenoid works in the same way as a permanent bar magnet.

Whose south and north poles are the entry and exit points for magnetic field lines, respectively.

Finite and infinite solenoid are the two forms of the solenoid.

A finite solenoid is one with a finite length, whereas an infinite solenoid is one with an unlimited length with insignificant end effects.

The magnetic field lines of the long infinite solenoid are parallel to the axis, and the magnetic field does not fluctuate over its length.

The magnetic field appears to be practically straight.

A solenoid is a coil comprising several circular turns of insulated copper wire wrapped tightly in a cylinder form.

A magnetic field surrounding a bar magnet produces the same field pattern.

One end of the solenoid serves as a magnetic north pole, and the other serves as a magnetic south pole.

The field lines within the solenoid are in the shape of parallel straight lines.

It indicates that the magnetic field within the solenoid is constant throughout.

The field within the solenoid is uniform, in other words.