Ruhi is writing some statements, choose the incorrect statement a… - Vidyadip

MCQ

Ruhi is writing some statements, choose the incorrect statement and help him:

A
Magnet is used in refrigerator door to keep it tightly closed.
B
Magnets are used in some pencil boxes to keep their lids shut tightly.
C
Needle of a compass deflects when we brought a magnet near it.
✓
Electromagnet is a permanent magnet.

✓

Answer

Correct option: D.

Electromagnet is a permanent magnet.

The magnets made by using electricity are called electromagnets.
Electromagnets are very useful because their magnetism or power of attraction can be switched “on” or “off” as desired.
That means it is temporary magnet.
As an example, if the electric current is switched on through its coil the electromagnet gets its magnetism and starts behaving like a magnet,
when it is switched off the electromagnet losses all its magnetism that means (it no longer behaves as a magnet).
So, it is considered as temporary magnet.

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