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Why is It Necessary to Introduce a Cylindrical Soft Iron Core Inside the Coil of a Galvanometer? - Physics

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Why is it necessary to introduce a cylindrical soft iron core inside the coil of a galvanometer?

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Solution

The cylindrical soft iron core, when placed inside the coil of a galvanometer, makes the magnetic field stronger and radial in the space between it and pole pieces, such that whatever the position of the rotation of the coil is the magnetic field is always parallel to its plane.

Concept: Moving Coil Galvanometer
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