What develops the magnetic field in a material placed in an applied magnetizing force (H)?

The process by which a magnetic field develops in a material when it is subjected to an applied magnetizing force is known as induction. When a magnetic material, such as iron or steel, is exposed to an external magnetic field, the magnetic domains within the material—tiny regions where the magnetic moments of atoms are aligned—begin to align themselves with the applied field. This alignment enhances the overall magnetic field within the material, resulting in magnetization.

Induction is fundamental to understanding how materials can become magnetized. The greater the magnetizing force applied, the more pronounced the induction effect, resulting in a stronger overall magnetic field. This behavior is a key concept in magnetism and is critical for various applications including electromagnets, transformers, and magnetic storage devices.

The other options do not pertain directly to the process of developing a magnetic field in the context of magnetization. Conduction relates to the flow of electric current through a material rather than magnetic properties. Heat transfer involves the movement of thermal energy, which is not relevant to how magnetic fields are created. Magnetic domain transfer could misleadingly imply movement of the domains rather than their alignment, which is what induction truly encompasses in this context.