Page 2 - CBW Magnet & their effects

6. Electromagnet Setup:
A wire is wound around a nail and connected to a
battery.
a) What type of magnet is this setup?
b) What happens if you switch off the current?

7. Demagnetizing a Magnet:

a) Mention two possible ways to demagnetize a magnet.
b) What happens to a magnet when it is heated?

8. Magnetic Field Lines:
Iron filings are sprinkled on a sheet of paper placed over a magnet.

a) Why do the iron filings arrange themselves in a specific pattern?
b) Why are the filings more concentrated at the ends of the magnet?

Case Studies & Application-Based Questions
9. Earth as a Magnet:
A freely suspended magnet always comes to rest in the north-south direction. This
happens because the Earth itself behaves like a giant magnet. The magnetic south pole
of the Earth is located near the geographic north pole, and the magnetic north pole is
near the geographic south pole. The north pole of a suspended magnet points toward
the geographic north because it is attracted to the Earth's magnetic south pole.
Similarly, the south pole of the magnet points toward the geographic south pole.

a) Earth’s magnetic south pole is located near the geographic _________ pole.
b) Why does a freely suspended magnet always point in the north-south direction?
c) The magnetic north pole of the Earth is located exactly at the geographic north
pole. (True/False)
d) Where is Earth’s magnetic field the strongest?
10. Navigation and Magnetism:
Magnets are materials that create an invisible magnetic field, which is strongest at their
ends—called the North and South poles. When a magnet is suspended freely, it always
aligns itself in the north-south direction. This property is useful in navigation and is used
by sailors and travelers through a device called the magnetic compass. Interestingly, the