The simplest motion producer is a solenoid, which consists of a coil with a soft iron core (or armature) which slips easily in and out of the coil. Soft iron is used because it does not retain its magnetism when the current is switched off; in other words, it does not become permanently magnetized.

The core of a transformer is made of soft iron because it has high permeability so it provides complete linkage of magnetic flux of the primary coil to the secondary coil. Therefore ithas high coercivity and low retentivity. Solve any question of Alternating Current with:-.

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When dc voltage source is applied across a primary coil of a transformer, the current in primary coil remains same, so there is no change in magnetic flux and hence no voltage is induced across the secondary coil. Hence, a step up transformer cannot be used to step up DC voltage .

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Soft iron is used to make the core of transformer, because of its :. - YouTube Soft iron is used to make the core of transformer, because of its :IV(1) low coercivity and low retentivity(2).

The simplest motion producer is a solenoid, which consists of a coil with a soft iron core (or armature) which slips easily in and out of the coil. Soft iron is used because it does not retain its magnetism when the current is switched off; in other words, it does not become permanently magnetized.