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QPage 285: Q9: HC Verma: Concepts of Physics - Volume 2 Magnetic Properties of Matter Page 285: Q9 Solution: To keep valuable instruments away from the earth's magnetic…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often treat a ferromagnetic box like a perfect magnetic Faraday cage, believing the interior field becomes zero; in reality iron shields by offering a low‑reluctance path that diverts most external lines, so the field inside is only reduced and can re‑enter if the material saturates or the enclosure is not continuous.

To keep valuable instruments away from the earth's magnetic field, they are enclosed in iron boxes. Explain.

Step-by-Step Verified Solution

**Answer:** Iron boxes provide magnetic shielding because iron has high permeability and redirects the magnetic field lines around the enclosed space. **Step-by-Step Explanation:** When a ferromagnetic material like iron is placed in a magnetic field, the field lines tend to concentrate inside the material because of its high permeability. An iron box provides a low-reluctance path for the magnetic field lines, so they pass through the walls of the box rather than through the interior. This shields the contents from the external magnetic field (e.g., the earth's magnetic field).

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