To make iron strip into a magnet, we put a iron strip on table. Now, take a bar magnet and place one of its poles near one edge of the iron strip. Without lifting the bar magnet, move it along the length of iron strip till we reach the other end. Now, lift the magnet and bring the pole (the same pole we started with) to the same point of the iron strip from which we began. Repeat this process about 30-40times. Bring some iron fillings near the iron strip and observe that the strip attracts the fillings. This indicates that the iron strip becomes magnet.