Import Question JSON

$\text{Hint: when the magnetic field is applied, domains aligned in the}$ $\text{direction of the field, grow in size and those aligned in the direction}$ $\text{opposite to the field reduce in size.}$ $\text{Explanation: Soft ferromagnetic materials are easily magnetized and}$ $\text{demagnetized by external fields. This property is due to the behavior}$ $\text{of tiny regions called magnetic domains within the material. In an}$ $\text{unmagnetized state, these domains have their individual magnetic}$ $\text{moments pointing in random directions, essentially canceling each}$ $\text{other out. When an external magnetic field is applied, the domains}$ $\text{aligned in the direction of the field experience a force and tend to}$ $\text{grow in size. Conversely, domains opposing the field shrink. More}$ $\text{importantly, the external field exerts a torque on the misaligned}$ $\text{domains, causing them to rotate and align with the applied field. This}$ $\text{reorientation strengthens the overall magnetization of the soft}$ $\text{ferromagnetic material.}$ $\text{Hence, option (4) is the correct answer.}$