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(a) Draw a circuit diagram to show how a soft iron piece can be transformed into an electromagnet.(b) Describe how an electromagnet could be used to separate copper from iron in a scrap yard.
(a) A soft iron piece can be transformed into an electromagnet, by winding an insulated copper wire around it and then passing current through the wire by connecting its two ends to a battery.
(b) In this process of separation, a large electromagnet is attached to a crane and moved over the scrap yard. As soon as the switch is turned on, it picks up the iron objects from the mixture and carries them to another location. Further, iron objects are dropped by switching off the current of the electromagnet coil. In this way, we will be left with copper objects in the scrap yard.
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