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7.f-Magnetization-and-Demagnetization-of-Objects.pptx
- 1. QUARTER II CONTENT STANDARD#3 DEMONSTRATE AN UNDERSTANDING OF THE RELATIONSHIP BETWEEN ELECTRICITY AND MAGNETISM IN ELECTRIC MOTORS AND GENERATORS
- 2. LEARNING COMPETENCIES AND OBJECTIVES: 7.Demonstrate the generation of electricity by movement of a magnet through coil
- 3. At the endof this presentation the students must be able to: •7.f. Demonstrate the magnetization by stroking.
- 4.
- 5. Magnetization of materialsvaries to the kind of materials a permanent magnet or current is in contact with. There are objects that we called magnetizable or non-magnetizable. Magnetizable objects are objects that can possess magnetic abilities.
- 6. This happen whenthey adapt the ability of a magnet to magnetize other objects. The positive and negative polarities of the objects realign due to excitation of the charges that follows the magnetic field of a magnetizable material.
- 7. On the otherhand non- magnetizable objects are those objects that does not possess the ability to magnetize other objects. Common example of magnetizable objects are metals and metalloids. While plastic and other liquid elements are non-magnetizable objects.
- 8. The process bywhich a magnetic substance attains magnetism or exhibit magnetic properties either temporarily or permanently is what we called magnetization.
- 9. On the otherhand, the process of removing or eradicating the magnetic property of a magnet is what we called demagnetization. There are ways to magnetize or demagnetize a permanent magnets.
- 10. For an objectto attain magnetization, the following procedures or methods are done. These processes are: • Single Touch Method • Double Touch Method • Electrical Method
- 11. Single Touch Method Singletouch method is done by rubbing a magnet along a magnetic substance from one end to another and lifting the magnet vertically upwards when it reaches the end, rubbing both upper and lower surface.
- 12. Double Touch Method Itis a process wherein two magnets are placed with each other at the center of the magnetic material and rubbed in opposite direction.
- 13. https://www.google.com.ph/search?q=electrical+method&tbm=isch&ved=2ahUKEwiK0 6K2xv_pAhWcx4sBHR_qBx8Q2- cCegQIABAA&oq=electrical+method&gs_lcp=CgNpbWcQARgAMgIIADICCAAyAggAMgIIA DICCAAyAggAMgIIADICCAAyAggAMgIIADoGCAAQBxAeOggIABAIEAcQHjoECAAQQ1CUg D9Y89s_YJXrP2gAcAB4AIABwwGIAY0UkgEENi4xOJgBAKABAaoBC2d3cy13aXotaW1n&scl ient=img&ei=RSzlXsqcI5yPr7wPn9Sf- AE&bih=582&biw=1205#imgrc=WkWKNsEaKWU5DM&imgdii=qm5kssalI64q1M Electrical Method This usescoil of wire attached to a dry cell allowing the passage of current to generate magnetic field. If steel bar is used, it becomes a permanent magnet. If a soft iron is used, it becomes a temporary electromagnet.
- 14. There are alsoways to demagnetize or to remove the magnetic property of a magnetic material. To destroy or to lose totally or partially the magnetism of a magnet, the following are some ways to do it:
- 15. Rough Handling It ishandling the magnetic materials carelessly like hammering or dropping the magnet https://www.google. com.ph/search?q=ha mmering+a+magnet &tbm=isch&ved=2ah UKEwiY4IyIzv_pAhU mzIsBHbzMAXwQ2- cCegQIABAA&oq=ha mmering+a+&gs_lcp =CgNpbWcQARgJMgI IADICCAAyAggAMgII ADICCAAyAggAMgIIA DICCAAyAggAMgIIAD oECAAQQ1Cs- gNYm60EYIzJBGgAcA B4AIABb4gBpQOSAQ MwLjSYAQCgAQGqA Qtnd3Mtd2l6LWltZw &sclient=img&ei=SDT lXpicDqaYr7wPvJmH4 Ac&bih=582&biw=12 05#imgrc=lmEZ96DR ZE9KCM https://www.google.com.ph/search?q=losing+magn etism&tbm=isch&ved=2ahUKEwiCw6n70v_pAhUBgp QKHZ4tCgEQ2- cCegQIABAA&oq=losing+magnetism&gs_lcp=CgNpb WcQAzICCAA6BAgjECc6BwgjEOoCECc6BQgAELEDOg QIABBDOgcIABCxAxBDOgYIABAFEB46BggAEAgQHjoE CAAQGFDieVjtuQFgo8sBaAFwAHgDgAGEAYgB5CCSA QUxMi4yOJgBAKABAaoBC2d3cy13aXotaW1nsAEK&s client=img&ei=aznlXsLhJYGE0gSe26gI&bih=582&biw =1205#imgrc=Ey29ln3rWISK1M&imgdii=fiA6H7C1Tz 66tM
- 16. https://www.google.com.ph/search?q=hammering+of+magnet+gif&tbm=isch&ved=2ahUKEwierOvS1f _pAhUFIqYKHZAMDkoQ2- cCegQIABAA&oq=hammering+of+magnet+gif&gs_lcp=CgNpbWcQDDoGCAAQBxAeOggIABAIEAcQHlCb W1iF0wFg8N8BaABwAHgAgAGuA4gBoBOSAQg0LjE1LjQtMZgBAKABAaoBC2d3cy13aXotaW1n&sclient=i mg&ei=PDzlXp6eAYXEmAWQmbjQBA&bih=582&biw=1205#imgrc=lmEZ96DRZE9KCM&imgdii=HsGn7S b2Ymv8sM Heating Heating magnet ata certain temperature called the curie point loses its magnetic characteristics. METAL CURIE POINT IRON 770 ◦C STEEL 880 ◦C NICKEL 358 ◦C COBALT 1121 ◦C
- 17. Induction Placing magnet sideby side with similar poles together induces polarity with each other, causing demagnetization. To avoid self demagnetization, magnets are placed side by side with their opposite poles. https://www.google.com.ph/search?q=proper+storing+of+magnets&tbm=isch&ved=2ahUKEwjDyLXt3P_ pAhUaR5QKHdbFAAUQ2- cCegQIABAA&oq=proper+storing+of+magnets&gs_lcp=CgNpbWcQDDIECCMQJ1CY0QFYyNkBYPTtAWgAc AB4AIABeIgBvQOSAQMwLjSYAQCgAQGqAQtnd3Mtd2l6LWltZw&sclient=img&ei=ykPlXsO7MZqO0QTWi4 Mo&bih=582&biw=1190&hl=en-GB&hl=en-GB#imgrc=RuiQ8Uz9AtmZPM&imgdii=u8byJWBQvZWVJM
- 18. Passing Electricity Magnets losesits magnetization as current changes direction continuously. This change in the direction of the current disturbs the alignment of molecular magnets resulting to demagnetization. https://www.google.com.ph/search?q=demagnetisation+by+heating&tbm=isch&ved=2ahUKEwil5JG43__p AhVoE6YKHcXcBHUQ2- cCegQIABAA&oq=demagnetisation&gs_lcp=CgNpbWcQARgEMgQIABBDMgIIADICCAAyAggAMgIIADIGCAAQ BxAeMgYIABAHEB4yBggAEAcQHjIGCAAQBxAeMgYIABAHEB46CAgAEAcQBRAeOggIABAIEAcQHlDFgQFYxIkBY LiuAWgAcAB4AIABgAGIAeALkgEDNS45mAEAoAEBqgELZ3dzLXdpei1pbWc&sclient=img&ei=gEblXqWkF- immAXFuZOoBw&bih=582&biw=1190&hl=en-GB&hl=en- GB#imgrc=lmEZ96DRZE9KCM&imgdii=jbED53teOo3OhM
- 19.
- 20. Let us conducta simple experiment. In this experiment we will need: Magnet Iron filings in a bottle Compass
- 21. Procedure: 1.Put iron filingsin a sheet of paper and check whether the iron filings are magnetized or not. To unmagnetized the filings, stir or move the iron filings gently on the paper and check it again until it unmagnetized.
- 22. 2.When the ironfilings are ready, placed it on a test tube or a small bottle. Fill the quarter portion of the bottle and cover it using a tape or cork to secure the iron filings from spilling out.
- 23. 3. Hold thetest tube horizontally. Shake or roll the test tube or bottle gently with your fingers to level out the iron filings inside.
- 24. 4. Then whenlevelled, touch the bottle or test tube with the north pole end of the permanent magnet the test tube’s end as shown in a video clip on the next slide.
- 25. Move the magnetalong the test tube from this end to the covered end. Lift the magnet off the test tube and repeat with ten or more strokes. Observe and record what happens inside the test tube.
- 26. 5. Gently laythe test tube on a table and bring compasses near both ends of the test tube as shown below. Observe and record what happens.
- 27. 6. Carefully shakethe test tube as shown below without moving the compasses. Place the test tube once again in line with the compass and check the magnetism of the filings. Record your observation
- 28. In the videowe observe the behavior of the iron filings in the bottle when a magnet is placed and stroked under it. Magnetization by stroking can only be possible if the object being stroked possess magnetic properties.
- 29. In our videothe iron filings become a temporary magnet. Each molecules realigned its positive and negative polarities when it was under the influence of the magnetic field of the magnet. As long as it is being influenced by the magnetic field, it will exhibit the properties of being a magnet.
- 30. But when putaway the magnet and shake the bottle that contains the magnetized iron filings, it will return to its normal state. That is because there are no magnetic field that excites the positive and negative polarities of the iron filings so these charge will be suspended inside the bottle.
- 31. THANK YOU AND GODBLESS! Prepared by: RICHMOND DV. BATAZAR LPT, SCIENCE 1O
- 32.