To keep valuable instruments away from the earth's magnetic field, they are enclosed in iron boxes. Explain.
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Valuable instruments are protected by enclosing in iron boxes because iron is ferromagnetic.
- Iron which is a ferromagnetic material with very high magnetic permeability.
- Ferromagnetic materials have the ability to attract magnetic field lines towards itself.
- Iron being a ferromagnetic material can easily attract the magnetic field lines of earth and make them passes through it.
-The field lines passes through the surface of the box and field inside the box will be zero.
-Thus the instrument is well protected within the iron box.
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To keep valuable instruments away from the earth's magnetic field, they are enclosed in iron boxes due to the ferromagnetic nature of iron.
Explanation:
- We know that iron is a ferromagnetic material and therefore has a high value of magnetic permeability (μ) . A ferromagnetic substance is strongly attracted towards the magnet, therefore, all the lines of earth magnetic field pass through the surface of the iron box and no continuous change pass through the valuable instrument.
- Thus, the magnetic field inside the box becomes zero and there is no anguish to the instrument.
- Therefore, due to the ferromagnetic nature of iron will be used to protect valuable instruments.
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