Why is the core of a moving coil galvanometer made of soft iron?

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The term galvanometer is used to refer to a meter which can measure

small currents, usually in the mA (10-3A) or mA (10-6A) range. When

a soft iron core is used, the magnetic field lines tend to crowd

through the core. It is because soft iron core is ferromagnetic in

nature. As a result, the strength of the magnetic field due to the

field magnet increases, which in turn increases the sensitivity of

the galvanometer.

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