Explanation:
At the end of the arm of the crane is a huge electromagnet. This means there is a highly paramagnetic material (especially aluminum) at the core surrounded by a coil of wire, like a solenoid - the coil has wounds around the aluminum. The operator of the crane can magnetize and demagnetise the electromagnetic by switching on or off (respectively) electric current passing through the wire. This is a practical application of Faraday’s principle of electromagnetic induction.
The following properties affect the strength of the electromagnet; the number of coils of wire around the paramagnetic material and the strength of the electric current.
Learn More:
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