How can a magnetic field be produced, using a wire, a battery, and and a nail?

It is fairly easy to build an electromagnet. All you need to do is wrap some insulated copper wire around an iron core. If you attach a battery to the wire, an electric current will begin to flow and the iron core will become magnetized. When the battery is disconnected, the iron core will lose its magnetism. Follow these steps.
Step 1 - Gather the Materials
One iron nail fifteen centimeters (6 in) long
Three meters (10 ft) of 22 gauge insulated, stranded copper wire
One or more D-cell batteries
Step 2 - Remove some Insulation
Step 3 - Wrap the Wire Around the Nail
Step 4 - Connect the Battery

By wrapping wire around the nail and attaching battery to the wire ends

Explanation:

We can use a pair of wire cutter to remove a few centimeters of insulation from each end of the wire that is used. Then neatly wrapping the wire around the nail. The more wire we wrap around the nail, the stronger our electromagnet will be. After that attaching the battery to the ends of the wire will turn the coil into an electromagnet.

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