Mechanical method of Magnet making
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| Magnet making process Mechanical method Take an iron nail or a needle. Keep it horizontally on a table. Take a bar magnet. Rub the nail from any one end to the other (in only one direction), with any one pole of the bar magnet. Repeat this many times without changing the pole or the direction of rubbing. The nail becomes magnetised (fig ). This process of magnetising by rubbing with a magnet is called mechanical method. Do it yourself Take a clean test-tube and fill it with iron filings. Close its mouth with a rubber cork. Observe the arrangement of iron fillings. Keep any one pole of a bar magnet near one end of the test tube. Rub that test tube with this pole along its surface in one direction (fig 1.14(a)), Repeat the rubbing without changing the pole and direction of rubbing. Now observe the arrangement of iron fillings in the test tube. Bring one end of the test tube near the north pole of a magnetic needle. What do you observe ? (fig 1.14(b)(. Bring the same end of the test tube near the south pole of the magnetic needle. What do you observe ? Record your observations. Shake the test tube and again bring the ends of the test tube near the poles of the magnetic needle and observer. Explain your observations with reasons. |
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