under what condition is the permanent magnet obtained if a current solenoid is used , explain with the help of diagram plz answer
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The conditions required to obtain permanent electromagnet when a current carrying solenoid is used are:
● The rod inside solenoid should be made of a magnetic material like steel, soft iron etc. This type of material can retain the magnetic properties for a long time after magnetization.
● Direct current should be used for solenoid.
● The turns should be closely packed and large in number for producing a uniform strong magnetic field
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