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Question

The intensity of the magnetic field due to earth at a point inside a hollow steel box is


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Solution

Magnetic Materials

There are mainly five types of magnetism:

  1. Diamagnetic materials where there is no permanent intrinsic atomic magnetic dipole moment. These materials are feebly repelled by a magnetic field.
  2. Paramagnetic materials possess permanent atomic dipoles. They are feebly attracted by a magnetic field.
  3. Ferromagnetic materials are a certain group of substances that tend to manifest or display strong magnetism in the direction of the field due to the application of a magnetic field. The cause of magnetism in these materials is mainly due to the alignment patterns of their constituent atoms..
  4. Other types are ferrimagnetic and anti-ferromagnetic materials.

Estimate the Magnetic Field

  1. When a magnet is brought closer to steel, it has no effect on the steel box.
  2. Steel is not a ferromagnetic material.
  3. Therefore, the magnetic field intensity will simply pass through the steel box without showing any effect.
  4. Hence, the intensity of the magnetic field due to earth at a point inside a hollow steel box is zero.

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