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MAPPING OF MAGNETIC FIELD
To map the magnetic field of a Bar Magnet when it is placed in Magnetic Meridian with its North- pole pointing towards North.
Drawing Board, board pin, compass needle, white paper and bar magnet.
1. A white sheet of paper is fastened to the drawing board using board pins or sellotape. (When doing this all magnetic and magnetic materials are moved far away from the drawing board)
2. A small plotting compass needle is placed near the edge of the paper and the board is rotated until the edge of the paper is parallel to the magnetic needle.
This position should not be disturbed throughout the experiment.
3. The compass needle is placed at the centre of the paper. e ends of the needle i.e the new positions of the North and South Pole are marked when the needle comes to rest. ese points are joined and straight line is obtained. is is the magnetic meridian.
4. Cardinal directions NEWS is drawn near the corner of the paper. e bar magnet is placed on the line at the centre of the paper with its north pole facing the geographic north. e outline of the bar magnet is drawn.
5. The plotting compass is placed near the North Pole and the ends of the needle are marked. Move the compass to a new position such that its south end occupies the positions previously occupied by its north pole. In this way proceed step by step till the South Pole of the magnet is reached.
6. The lines of the magnetic forces are drawn by joining the plotted points around the magnet. In the same way several magnetic lines of force are drawn around the magnet as shown in the gure.
7. The Curved lines represent the magnetic eld of the magnet. e direction of the lines is shown by arrows heads.
The magnetic lines of force are mapped when the bar magnet is placed. Direction of the lines is shown by arrows heads.
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