Electromagnet is a temporary magnet made of soft iron. Soft iron is magnetised by the magnetic field of a coil or solenoid.
Soft iron has high magnetic permeability due to which it gets magnetised quickly and it loses magnetic properties easily due to the fact that it has low magnetic retentivity .
Magnification is -5: The negative magnification means the image is real and the absolute value(without negative sign) of magnification (5) indicates that the image is real and inverted.
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