Question

vTwo kinds of magnets are shown below.



Cameron works in a junkyard, and he needs a machine that can lift scrap metal and then let go of it. Which type of magnet does Cameron need, and why?
A.
Cameron needs a magnet like magnet 1 because it can be turned on and off.
B.
Cameron needs a magnet like magnet 2 because it does not need electricity.
C.
Cameron needs a magnet like magnet 1 because it can pick up all materials.
D.
Cameron needs a magnet like magnet 2 because it is stronger than magnet 1.
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Answer 1

A.

Magnet 1 is an electromagnet (coil/current) and can be switched on and off, so it can lift scrap when on and release it when turned off. A permanent magnet (magnet 2) would always hold the metal.