What happens to magnetic fields when a conductor is looped into a coil?

When a conductor is looped into a coil, the magnetic fields produced by the individual loops combine to create a stronger and more concentrated magnetic field. This phenomenon is due to the principle of magnetic flux: each loop of the conductor generates its own magnetic field, and when multiple loops come together in a coil configuration, the magnetic fields add to each other.

The density, or strength, of the magnetic field generated by a coil increases with the number of loops—essentially, more loops provide a greater surface area for the magnetic field lines to emerge, leading to a higher intensity of the overall magnetic field. This is particularly important in applications like electromagnets, transformers, and inductors, where a strong magnetic field is crucial for their operation.

In contrast, the other options might suggest a weakening, chaos, or unchanged state of the magnetic field, which doesn’t align with the observed behavior of magnetic fields when conductors are shaped into coils. The systematic arrangement of the loops ensures a coherent and intensified magnetic field.