Magnetism CH 5 Electricity and Magnetism 1 2
- Slides: 31
Magnetism CH 5 – Electricity and Magnetism 1
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Magnetism � Describes magnets all phenomena caused by �A magnet is an object that can attract other objects that contain iron, cobalt or nickel � How do they work? It’s… complicated � Quantum physics and electron spin and magnetic dipole moment � The short answer? Basic property of certain substances 4
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Magnetism Notes � In order for a substance to be considered magnetic it must have 2 criteria: 1. 2. 6 It must have domains (north and south poles) The domains must be aligned
Magnet Rules 1. 2. 3. 4. 7 Has a north and south pole Opposite poles attract, same poles repel If you cut a magnet in half, each piece has a north and south pole The more distance between two poles, the weaker the force will be (attraction or repulsion)
Notes � By convention, the north pole of a magnet corresponds to the end that naturally turns towards the Earth’s magnetic pole that is nearest to the Earth’s North Pole � So technically speaking… the Earth’s North pole is ‘magnetically a south pole’ � Confusing… 8
Magnetic Fields � https: //phet. colorado. edu/en/simulation/legacy/magn et-and-compass 9
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Magnetic Fields �A magnetic field is the area around which the effects of a magnet are felt by another magnet �A magnetic field always travels from North to South poles and can travel in all directions as long as there is attraction or repulsion 11
Example 1 12
Example 2 13
Example 3 14
Example 4 15
Example 5 16
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Magnetic Shield � https: //www. youtube. com/watch? v=URN-Xy. ZD 2 v. Q 18
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Earth’s Magnetic Field � Inside the Earth’s surface there is a huge amount of ferromagnetic liquids. These liquids are constantly in motion around a solid iron core and produce a massive magnetic field which can be felt anywhere around the world 20
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Poles Reversing � https: //www. scientificamerican. com/article/earth-s- magnetic-field-flip-could-happen-sooner-thanexpected/ 22
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Magnetic Field of a Live Wire � Electrons flowing through a wire generates a magnetic field � Right Hand Rule � Gives us current direction (which way the electrons are flowing) and magnetic field direction � Thumb: points to current direction (-) (electrons / electricity flows from + to -) � Fingers: curl in the magnetic field direction (N to S) � Fingertips 24 are like the N part of the compass
� Thumb: points to current direction (-) (electrons / electricity flows from + to -) � Fingers: curl in the magnetic field direction (N to S) 25
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Arrow Notation � Thumb Points Away From Paper � Thumb Points Into Paper 27
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Ferrofluid � https: //www. youtube. com/watch? v=3 Cg. Kmf. Inv_k 31
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