Page 159 - SCERT Kerala State Syllabus 8th Standard Basic Science Textbooks English Medium Part 1_Neat

Extended activities

1. Take six ferrite ring magnets. Pass two of them through a
pencil and fix as shown in the figure. Take a thick sheet of
thermocol. Fix two ring magnets in each groove in such a
way that the distance between the ring magnets on the pencil
and the magnets fixed on the thermocol are the same. Arrange
them in such a way that the sharp end of the pencil touches
on a plastic or hylum sheet fixed vertically. Turn the other
end of the pencil slightly. What do you observe? Prepare
your observation notes.

2. Collect five small identical disc magnets. Place each of the
magnets in each lid of mineral water bottles in such a way
that the north pole faces down. Place the lid one by one in
water filled in a plastic basin. Write down your observations
and state the reason behind them.

3. We prepared the map of magnetic flux lines by conducting
an experiment placing the north pole of a magnet pointing in
the north direction. Now place the north pole of the bar magnet
pointing in south direction and mark the magnetic flux lines.
Observe the difference between the maps.

158 Basic Science VIII