Question

Why are magnetic field lines closed curves?

Answer 1

The magnetic impact 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 own velocity and the magnetic field. Magnetic field lines are essentially unbroken lines with no beginning or finish. They go in the direction of the north pole to the south pole. Electric field lines begin on positive charges and finish on negative charges, whereas these lines begin on positive charges and terminate on negative charges.

Complete answer:
Because magnetic field lines begin at the north pole and end at the south pole of the magnet, they are closed curves. Magnetic field lines propagate from the north pole outside the magnet's body to the magnet's body, and from the south pole to the north pole inside the magnet's body, and are closed curves.

The field lines appear to be closed loops, but we can't tell if they're closed or open just by looking at the image of the field lines since we don't know how the lines flowing through the bar magnet are aligned. The direction of a magnetic line at a given position corresponds to the direction of the magnetic force at that site's north pole.

Because the force near the north pole is directed in the same direction as the magnetic field line. As a result, magnetic lines always begin at the magnet's 'N' pole and terminate at the magnet's 'S' pole. The magnetic lines inside the magnet, on the other hand, range from the S-pole to the N-pole. As a result, the magnetic field lines have been closed.

Note: At any point in space, the magnetic field's direction is tangent to the field line.A tiny compass will point towards the field line's direction.The field's strength is related to the distance between the lines. It is proportional to the number of lines per unit area that are parallel to the lines (called the areal density). Magnetic field lines can never cross, implying that each point in space has its own magnetic field. Magnetic field lines are endless, producing closed loops that have no beginning or end. They run all the way from the north to the south pole.