Bennett Mechanical Comprehension Practice Test 2026 – The Complete All-in-One Guide to Exam Success!

The statement that magnetic field lines are closed lines is correct because it reflects a fundamental principle of magnetism. Magnetic field lines represent the direction and strength of a magnetic field, emanating from the north pole of a magnet and returning to the south pole outside the magnet. This creates a continuous loop, which is characteristic of magnetic fields.

In more detail, the concept of closed loops emphasizes that magnetic field lines do not begin or end in space; rather, they always form closed loops. This means that if you were to visualize these lines around a magnet, you would see that they extend from the north pole, travel through the surrounding space, and re-enter at the south pole, completing the loop. This demonstrates that magnetic lines of force indicate the flow of magnetic energy and help to understand how magnets interact with materials and each other.

This understanding of closed magnetic lines is foundational in both theoretical and practical applications of magnetism, such as in designing magnetic devices, motors, and understanding the Earth's magnetic field.