Question

Which magnet will you use?
(a) Iron is to be separated from trash.
(b) You are lost in a forest.
(c) A window shutter opens and shuts continuously in the wind.

Answer 1

(a) Electromagnet can be used to separate iron from trash.

(b) Bar magnet or loadstone can be used to find the direction in the forest. This is because a bar magnet, when suspended freely, always rests in north-south direction.

(c) Permanent magnet can be used to stop the continuous shuttering of the window in the wind.