how can you convert a solenoid into an electromagnet?

When electrical current flows through a conductor it generates a magnetic field, and the direction of this magnetic field with regards to its North and South Poles is determined by the direction of the current flow within the wire. This coil of wire becomes an Electromagnet with its own north and south poles exactly the same as that for a permanent type magnet.  The strength of this magnetic field can be increased or decreased by either controlling the amount of current flowing through the coil or by changing the number of turns or loops that the coil has.

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By passing a considerable amount of current through it,which leads to the formation of a magnetic field around the solenoid.
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