AIIMS 2018 Physics Magnetic Materials MCQ Question
Assertion : To protect any instrument from external magnetic field, it is put inside an iron body.
Reason : Iron has high permeability.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
In the context of magnetism, iron is a ferromagnetic material with high permeability, which means it can easily become magnetized and allows magnetic field lines to pass through it with minimal resistance. As a result, when a magnetic field is applied, the majority of the field lines concentrate within the iron, effectively reducing the magnetic field strength in the surrounding space, which can be considered as a "free" magnetic field region. Other options are not applicable in this scenario, as they do not provide relevant information or alternative explanations regarding the behavior of magnetic fields in ferromagnetic materials. Understanding this concept is crucial for grasping the principles of magnetism and the behavior of materials in magnetic fields.
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