To Plot the magnetic field with the help of fine iron filings (a) single bar magnet (b) two bar magnets, such that their opposite poles face each other (c) two bar magnets, such that their similar poles face each other. Materials required 1. Fine iron filings filled in a sprinkler (same kind of sprinkler used for salt or pepper). 2. A foolscap white sheet of paper. 3. Two bar magnets. 4. Two thick and wide books of same thickness. Procedure 1. Arrange the thick books in such a way that you get a flat smooth surface, wide enough for the fulls cape white sheet of paper. 2. Make a small gap between the books and insert a bar magnet between the gap. 3. Spread the white sheet of paper on the books and secure it with cello tape. 4. Sprinkle iron filings all over the paper evenly. 5. Tap the paper gently. You will observe that iron filings act like thousands of tiny magnetic compasses and align themselves along the magnetic lines of force as shown in figure Fig. 01. These lines come out of the magnet from the north pole and end up at south pole. 6. Now place two bar magnets in the gap between the books, such that north pole of one magnet is facing towards the south pole of other magnet as shown in figure : 02. Repeat the activity again and observe the magnetic field. 7. Now place two bar magnets in the gap between the books, such that north poles of both magnets face each other as shown in figure :03). Repeat the activity again and observe the magnetic field. In this case you will find that at point P, between the two norths poles there are no iron filings. It is because there is no magnetic field at P. This is called neutral point.
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