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This document discusses different types of magnets including natural and artificial magnets. It describes the general properties of magnets including that they have two poles, north and south, and that like poles repel while unlike poles attract. It provides examples of applications of magnetism including maglev trains which use magnetic levitation to move fast without wheels. It discusses early discoveries about magnetism including how William Gilbert observed the Earth acts like a large magnet. It also explains how a smartphone can function as a compass using its internal magnetometer.
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This document discusses the key properties and concepts relating to magnets, including:
1) Magnets attract iron and other magnets, with opposite poles attracting and like poles repelling, and they have an invisible magnetic field traced by iron filings.
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Magnets have been known for centuries and have magical properties. Magnetism is the force of attraction or repulsion between magnetic materials due to the arrangement and spin of electrons in atoms. Magnets always have two poles - a north and a south pole - and like poles repel while opposite poles attract. The Earth itself acts as a large magnet with a magnetic field that is strongest at the North and South magnetic poles.
Magnetism
Magnets have been known and used for navigation for centuries, with the ancient Greeks using a magnetic stone called magnetite. Magnetism is the force of attraction or repulsion between magnetic materials due to the arrangement of electrons in their atoms. The Earth itself acts as a large magnet, with a magnetic field strongest at its north and south magnetic poles. Other planets and the Sun also have magnetic fields extending into space.
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Topics Included:
• Origin
• Definition and Example
• Type of Magnets
• Type of Materials
• Properties of Magnet
• Methods to make a Magnet
• Magnetic Compass
• Difference between Permanent and Temporary Magnet
• Important Definitions
• Worksheet
CH-FUN WITH MAGNET
According to Greek legend, magnetism was first discovered by a shepherd named Megnes in Megnesia, Greece. His iron stick and nails had become attracted to a magnetic rock, which was named magnetite after the shepherd or country. Magnets have two poles, a north pole and a south pole, which always exist in pairs and cannot be separated. A compass uses a magnetic needle that aligns in the north-south direction, with its red end pointing north.
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This document discusses different types of magnets. It explains that natural magnets occur naturally without artificial means, while artificial magnets are substances that are given magnetic properties through artificial means like iron or cobalt. Magnetic substances are strongly attracted to magnets and can be converted into artificial magnets. The document also describes how a magnetic compass uses a magnet's poles to point toward geographic north and south, aiding in navigation.
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Magnetic hill
Magnetic Hill is a gravity hill located 30 km from Leh in Ladakh, India. It is situated on the Leh-Kargil-Srinagar national highway. The alignment of the road with the slope of the background creates the illusion that cars are able to drift upwards when traveling south. It was first noticed in the 19th century that motorists had to accelerate to prevent rolling backward up what appeared to be a hill. The magnetic hill phenomenon is an example of an optical illusion caused by the surrounding terrain.
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This document discusses the key properties and concepts relating to magnets, including:
1) Magnets attract iron and other magnets, with opposite poles attracting and like poles repelling, and they have an invisible magnetic field traced by iron filings.
2) Magnets work due to the spin of electrons within atoms forming magnetic domains that align, with stronger magnets having more aligned domains.
3) The Earth acts as a giant magnet due to its iron-nickel core, which spins and creates our planet's magnetic field that has shifted over time and protects us with its magnetosphere.
Earth’s Magnetism
The document discusses the Earth's magnetism. It explains that the Earth behaves like a giant bar magnet with a north and south magnetic pole. These magnetic poles are different from the geographic north and south poles and move about 10 km each year. The Earth's core is made of iron, a magnetic material, and its liquid outer core circulating around generates the planet's magnetic field through a process called the dynamo theory. The Earth's magnetic field protects the atmosphere from the sun's charged particles and is responsible for the northern and southern lights by trapping and directing solar particles toward the poles.
Magnetism3 power point
Magnets have been known for centuries and have magical properties. Magnetism is the force of attraction or repulsion between magnetic materials due to the arrangement and spin of electrons in atoms. Magnets always have two poles - a north and a south pole - and like poles repel while opposite poles attract. The Earth itself acts as a large magnet with a magnetic field that is strongest at the North and South magnetic poles.
Magnetism
Magnets have been known and used for navigation for centuries, with the ancient Greeks using a magnetic stone called magnetite. Magnetism is the force of attraction or repulsion between magnetic materials due to the arrangement of electrons in their atoms. The Earth itself acts as a large magnet, with a magnetic field strongest at its north and south magnetic poles. Other planets and the Sun also have magnetic fields extending into space.
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Topics Included:
• Origin
• Definition and Example
• Type of Magnets
• Type of Materials
• Properties of Magnet
• Methods to make a Magnet
• Magnetic Compass
• Difference between Permanent and Temporary Magnet
• Important Definitions
• Worksheet
CH-FUN WITH MAGNET
According to Greek legend, magnetism was first discovered by a shepherd named Megnes in Megnesia, Greece. His iron stick and nails had become attracted to a magnetic rock, which was named magnetite after the shepherd or country. Magnets have two poles, a north pole and a south pole, which always exist in pairs and cannot be separated. A compass uses a magnetic needle that aligns in the north-south direction, with its red end pointing north.
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This document discusses different types of magnets. It explains that natural magnets occur naturally without artificial means, while artificial magnets are substances that are given magnetic properties through artificial means like iron or cobalt. Magnetic substances are strongly attracted to magnets and can be converted into artificial magnets. The document also describes how a magnetic compass uses a magnet's poles to point toward geographic north and south, aiding in navigation.
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Iron particles are lined up when a magnet is brought close to iron. When two bar magnets are placed close together with the same poles facing, they will repel each other. The magnetic field consists of field lines that emerge from the North pole and reenter at the South pole. Magnets are made of iron, nickel, or cobalt. Magnetic materials such as iron and steel are attracted to magnets, while non-magnetic materials like plastic and wood are not. To preserve a bar magnet, it should be stored with another magnet to maintain its magnetic field.
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The magnetic force occurs between magnets and between magnets and some metals. Magnets have two poles called north and south that attract different poles but repel similar poles. Magnetism is caused by the movement of electric charges like electrons in atoms. Without magnetism, we would not have electricity or electric motors, and many modern technologies like phones, computers, speakers, and earphones would not exist.
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The Earth has a magnetic field generated by circulating ions in its liquid iron core. The field emerges from the geographic North Pole and re-enters at the South Pole, and its strength varies by location. The magnetic declination is the angle between magnetic and geographic axes, while magnetic inclination is the angle the field makes with the horizontal. Materials can be classified as diamagnetic, paramagnetic, or ferromagnetic based on how their atoms respond to magnetic fields. Ferromagnetic materials like iron contain magnetic domains that align when magnetized. The hysteresis curve shows the relationship between magnetic field strength and flux density, exhibiting properties like retentivity and coercivity that differ between soft iron and steel.
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Magnets have the ability to attract some metals due to magnetism. All magnets have two poles, a north pole and a south pole. When two magnets are placed together, the same poles will repel each other while opposite poles will attract. Magnetism has many useful applications such as in compasses, locks, motors, and storing digital information.
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This document summarizes different types of magnets and how they were discovered. There are four main types of magnets: horseshoe, bar, cylindrical, and ball-ended. Magnets produce invisible magnetic fields that attract ferromagnetic materials like iron. Permanent magnets are objects made of magnetized materials that create their own persistent magnetic fields, like refrigerator magnets. Ferromagnetic materials like iron, nickel, and cobalt are strongly attracted to magnets.
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2) Hans Christian Oersted discovered that electric currents create magnetic fields in 1820, showing that electricity and magnetism are related.
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Magnetism is produced by magnets which have north and south poles and magnetic field lines. The earliest magnets were naturally occurring lodestone. Magnets attract opposite poles and repel like poles. The Earth itself acts like a giant bar magnet due to its nickel-iron core. Magnetic substances are composed of small magnetic domains that align when exposed to an external magnetic field. Electricity and magnetism are related because electric currents produce magnetic fields. Electromagnets are coils of wire that produce strong magnetic fields when electric current passes through. Galvanometers use electromagnets to measure electric current. Electric motors convert electric current into rotational motion using electromagnetic induction. Generators also use electromagnetic induction to produce electric current from mechanical motion. Direct
Electromagnetism
The document discusses magnetism and magnets. It begins by explaining that the ancient Greeks and Romans knew that the mineral lodestone was magnetic and could attract iron. It then provides details on lodestone and other naturally magnetic materials called ferromagnets that strongly attract metals like iron. The document outlines the basic properties of magnets, including that they have north and south poles and opposite poles attract while like poles repel. It concludes by describing different types of magnets such as permanent, temporary, and electromagnets as well as their common shapes.
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The document discusses the earth's magnetism and how it was studied over time. It explains that early civilizations noticed magnetic properties in rocks and how compasses were used for navigation. William Gilbert conducted experiments in 1600 which showed that the earth acts like a giant bar magnet. The dynamo theory later emerged to explain the earth's magnetic field as being generated by convection currents in the liquid outer core. Studies of ancient rocks have provided evidence that the polarity of the earth's magnetic field has reversed many times in the past.
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Magnetism and Electromagnetism discusses the relationship between magnetism and electricity. It describes how magnets have north and south poles that attract or repel, and how the Earth itself acts as a large magnet. It then explains how an electric current produces magnetism through electromagnets, and how changing magnetic fields induce electric currents, the basis of electric generators. Transformers are also summarized, which use this principle to increase or decrease voltage for power transmission.
slide western internall ajfk sah fahfas hfs a
This document discusses magnetic fields and magnets. It begins by providing a brief history of magnetism, noting that magnetic phenomena were first observed over 2500 years ago. It then introduces the concept of magnetic fields, explaining that magnets attract ferromagnetic materials like iron and have both north and south poles. The document states there are six common types of magnets and explains the two fundamental laws of magnetism - that like poles repel each other while opposite poles attract. It concludes by noting that the Earth itself acts like a large bar magnet, with its south magnetic pole located near its north geographic pole.
Magnatism final paper
This document discusses the history and principles of magnetism. It begins with a brief history of magnetism starting in 600 BC with the discovery of lodestone in Greece. Key developments include the first compass in 121 AD in China and William Gilbert's work "De Magnete" in 1600 which provided the first rational explanation that the Earth itself was magnetic. The document then discusses the principles behind magnets including types (permanent, temporary, electromagnets), magnetic properties (poles, fields, domains), and the relationship between electricity and magnetism including how electromagnets work. It concludes by noting how understanding of magnetism has led to many modern applications and future possibilities.
Applied Physics, diploma, magnetism, electromagnetism
This document discusses magnetism and magnetic materials. It defines a magnet and magnetic field. It explains that magnets have north and south poles and that opposite poles attract while like poles repel. It describes different types of magnetic materials including ferromagnetic, paramagnetic, and diamagnetic materials. The document also discusses how to magnetize and demagnetize ferromagnetic materials as well as applications of magnetism such as in electromagnets and medical imaging.
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Module No. 26
1. Electricity and magnetism are branches of physics that deal with charges in motion and observations relating to electricity and magnetism respectively.
2. A magnet is a body that attracts small pieces of iron and points toward the north-south direction when suspended freely. It has a north pole and a south pole. Like poles repel each other, while unlike poles attract.
3. Electromagnetism is produced when an electric current passes through a coil surrounding a magnetic material like iron. Electromagnets have many applications and their strength depends on factors like the current and number of turns in the coil.
Magnetic Earth
Sir William Gilbert hypothesized in the late 1500s that Earth acts as a giant magnet, explaining why compasses point north. While Earth's core is too hot to be the source of magnetism, the circulation of molten material in the core is related to Earth's magnetic field. Earth's magnetic poles are located in northern Canada and Antarctica, differing from the geographic poles. Earth's magnetic field can magnetize ferromagnetic materials like iron over long periods of time.
Magnetism f.khadaad
1. Magnets can be natural or artificial. Natural magnets are made of the mineral magnetite while artificial magnets are usually made of steel or iron alloys.
2. All magnets have two poles - a North pole and a South pole. The magnetic force is strongest at these poles. A basic law of magnetism is that like poles repel each other while unlike poles attract.
3. Electromagnets are magnets that are temporarily magnetized by running an electric current through a coil of wire wrapped around an iron core. They are used in many electrical devices such as electric bells, telephones, loudspeakers, and industrial lifting magnets.
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- 2. -PRESENTED BY, SAGARA SL SURENDRAN PHYSICAL SCIENCE.
- 5. NATURAL MAGNET • Magnets obtained directly from the nature are natural magnets. • Magnetic properties of the substance are known to people from ancient times. • In 800 BC a particular mineral discovered in a place named Magnesia was found to possess an amazing property that they could attract pieces of iron . • It was named magnetite . • When suspended freely, the pieces of mineral were found to indicate a particular direction and came to be known as leading stone.
- 7. ARTIFICIAL MAGNETS • Artificial magnets are prepared by men using elements like iron ,cobalt, nickel or their mixture with other elements. • Artificial magnets are much stronger than natural magnets. • Depending on the requirements these magnets are made in various shapes and sizes.
- 10. G E N E R A L P R O P E R T I E S G E N E R A L P R O P E R T I E S General properties of magnet 1. Magnets usually have two poles. • The end of the magnet which points north when magnet is free to turn on a vertical axis is the north-seeking pole , simply the N pole. • The opposite end which points south is the south seeking pole. • Magnets if cut into pieces every piece will still have two poles.
- 11. 2. Like magnetic poles repel and unlike poles attract.
- 12. MAGLEV TRAINS • Maglev trains or Magnetic Levitation trains are trains without wheels that move fast over the rails. • Maglev is a transport method that uses magnetic levitation to move vehicles without touching the ground. • With maglev a vehicle travels along a guide way using magnets to create both lift and propulsion , thereby reducing friction by a great extent and allowing very high speed.
- 13. MAGLEV TRAINS
- 14. WORKING PRINCIPLE • The interaction between the magnetic fields created by electromagnets at the bottom of the train and the magnetic field resulting from the arrangement of the rails that the train rises a little above and move forward fast. • As the movement is one with no contact between train and rails both energy loss due to friction and noise pollution are reduced .
- 15. MAGLEVTRAINS
- 16. WILLIAM GILBERT(1544-1603) William Gilbert was an English scientist and physician who is credited by many as the “Father of Electricity and Magnetism”. He collaborated with everyone from ships captains and navigators to compass makers and performed experiments using a spherical magnetic lodestone and freely moving needle. He observed the magnetic forces produced circular motion and he connected the phenomenon of magnetism with the rotation of the earth. The earth acts like a large magnet, this was first discovered by the scientist William Gilbert. EARTH AS A MAGNET
- 17. EARTH AS A MAGNET The nickel iron core of the earth gives the earth a magnetic field much like a bar magnet
- 18. EARTH AS A MAGNET Earth acts as a large magnet. William Gilbert found that just as the earth has north and south geographically it has the north and south pole when considered as a magnet. The south pole of earth’s magnet is near to geographic north pole. The north pole of the earth’s magnet is near to the geographic south pole.
- 19. MAGNETIC COMPASS MAGNETIC COMPASS is the oldest instrument for navigation and has been a vital tool for navigators at sea for centuries. A magnetic compass work because earth is like a giant magnet surrounded by a huge magnetic field. The magnetic field of earth causes a magnetized needle of iron or steel to swing in north- south position.
- 20. A SMARTPHONE CAN BE USED AS COMPASS A smartphone can be used as a compass because of the magnetometer inside it.
- 21. N S Iron nail Coil of wire Electromagnet When an electric current is passed through a coil of wire wrapped around A metal core , a very strong magnetic field is produced. This is called an electromagnet.
- 22. T H A N K Y O U