Question

Two 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 pick up all materials.
B.
Cameron needs a magnet like magnet 2 because it is stronger than magnet 1.
C.
Cameron needs a magnet like magnet 2 because it does not need electricity.
D.
Cameron needs a magnet like magnet 1 because it can be turned on and off.

Answer 1

D. Cameron needs a magnet like magnet 1 because it can be turned on and off.

Reason: an electromagnet (magnet 1) can be energized to pick up ferrometal scrap and de‑energized to release it. A permanent magnet (magnet 2) cannot be switched off, so it would hold onto the metal.