Which one of the following statements regarding magnetic field is correct?

Key Points

• Magnetic field lines are closed curves which means they form continuous loops without beginning or end.
• These lines emerge from the north pole of a magnet and enter the south pole, continuing inside the magnet back to the north pole.
• This characteristic of magnetic field lines indicates that magnetic monopoles do not exist; magnets always have both a north and a south pole.
• Magnetic field lines never intersect each other because at the point of intersection, there would be two directions of the magnetic field, which is not possible.

Additional Information

• Magnetic fields are vector fields characterized by both magnitude and direction.
• They are produced by electric currents, which can be macroscopic currents in wires, or microscopic currents associated with electrons in atomic orbits.
• Magnetic fields are fundamental to the operation of many modern technologies, including electric motors, generators, and transformers.
• The study of magnetic fields is a key part of electromagnetism, a major branch of physics.
• Understanding magnetic fields is essential for the study of electromagnetic waves, which include visible light, radio waves, and X-rays.