A crane uses a mysterious object ‘X’ to separate magnetic materials from junk. The object ‘X’ is most probably a:

Magnetic material

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Electromagnet

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Permanent magnet

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None of the above

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Solution

The correct option is B
Electromagnet

The crane has to lift magnetic material during which the object should act as a magnet. But, while dumping it should lose its magnetic properties. So, the crane uses an electromagnet.

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