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Points to remember
* Magnetites are natural magnets. They are called magnetic stones.
* Man-made magnets are called artificial magnets.
* Substances which are attracted by magnet are called as magnetic substances.
* Substances which are not attracted by magnet are called non-magnetic substances.
* A freely suspended magnet always comes to rest in north-south direction.
* The end of the magnet that points to the north is called the North Pole. The end that points to the south is called the South Pole.
* A compass is an instrument which is used to find directions.
* Like Poles (N-N, S-S) repel each other and unlike poles (N-S, S-N) attract each other.
* Magnets lose their properties if they are heated or dropped from a height or hit with a hammer.
Through this activity you' be able to understand the properties of magnetic poles and magnetic field lines.
Step 1: Type the URL given or scan the QR code to launch the activity page.
Step 2: A diagram of a bar magnet and a magnetic needle are there. Click and drag the magnetic needle with the use of mouse, around the bar magnet. Observe the position of the magnetic field lines and how the needle rotates according the poles.
Step 3: Click the 'Next navigation icon'. A grid of magnetic needles around a bar magnet will appear. Click and drag the bar magnet. Observe the changes of the needles.
Step 4: Click the 'field lines' check box at the bottom of the activity window to see the magnetic field lines.
http://www.physics-chemistry-interactive-flash-animation.com/ electricity_electromagnetism_interactive/bar_magnet_magnetic_ field_lines.htm
*Pictures are indicative only
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