Why is it necessary to use a cylindrical soft iron core in a galvanometer?
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Soft iron is a ferro-magnetic material and its placement between the poles reduces the reluctance of the flux path so that even a small amount of exciting current can produce sufficient amount of flux.
Cylindrical shape is provided so that the air gap with respect to the pole faces is uniform ( and minimum ) thus producing an uniform radial Field
Cylindrical shape is provided so that the air gap with respect to the pole faces is uniform ( and minimum ) thus producing an uniform radial Field
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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.
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