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... Example 21-5 Blood contains charged ions, so blood flow can be measured by applying a magnetic field and measuring the induced emf. If a blood vessel is 2 mm in diameter and a 0.08 T magnetic field causes an induced emf of 0.1 mv, what is the flow velocity of the blood? OSE: = B ℓ v v = / (B ...
... Example 21-5 Blood contains charged ions, so blood flow can be measured by applying a magnetic field and measuring the induced emf. If a blood vessel is 2 mm in diameter and a 0.08 T magnetic field causes an induced emf of 0.1 mv, what is the flow velocity of the blood? OSE: = B ℓ v v = / (B ...
21.1 Magnets and Magnetic Fields
... another, and magnetic poles that are different attract one another. 2. A magnetic field will either attract or repel another magnet that enters the field. 3. For a material to be magnetized, most of its magnetic domains must be aligned. 4. The fields interact, and the field between the magnets becom ...
... another, and magnetic poles that are different attract one another. 2. A magnetic field will either attract or repel another magnet that enters the field. 3. For a material to be magnetized, most of its magnetic domains must be aligned. 4. The fields interact, and the field between the magnets becom ...
2.3 Gyromagnetic Ratio - McMaster Physics and Astronomy
... I prove in the appendix that this formula indeed gives the correct torque for any orientation of the rotor with respect to the magnetic field. ...
... I prove in the appendix that this formula indeed gives the correct torque for any orientation of the rotor with respect to the magnetic field. ...
Build an Electromagnet Problem: How can I make a stronger magnet
... Research: You have experimented with magnets in class, but scientist sometime need to use very powerful magnets. But a powerful magnet has a problem, how can the magnet be turned off and on? In 1820, a Danish physicist Hans Christian Oersted, discovered that there was a relationship between electric ...
... Research: You have experimented with magnets in class, but scientist sometime need to use very powerful magnets. But a powerful magnet has a problem, how can the magnet be turned off and on? In 1820, a Danish physicist Hans Christian Oersted, discovered that there was a relationship between electric ...
File
... When the switch is pressed and then released, would the bell go ‘ding-dong’ or ‘dong-ding’? Give a reason for your answer. ...
... When the switch is pressed and then released, would the bell go ‘ding-dong’ or ‘dong-ding’? Give a reason for your answer. ...
printer-friendly version of benchmark
... further research into the creation of magnetic fields using electrical currents. To learn more about Oersted’s demonstration and electromagnetism, go to http://www-spof.gsfc.nasa.gov/Education/whmfield.html. Without the movement of electric charges, magnetism does not exist. In metals that do not ma ...
... further research into the creation of magnetic fields using electrical currents. To learn more about Oersted’s demonstration and electromagnetism, go to http://www-spof.gsfc.nasa.gov/Education/whmfield.html. Without the movement of electric charges, magnetism does not exist. In metals that do not ma ...
Slide 1
... rarely in the course of human events have so many starting equations been given in so little time ...
... rarely in the course of human events have so many starting equations been given in so little time ...
mag03
... (B+). At point "a" almost all of the magnetic domains are aligned and an additional increase in the magnetizing force will produce very little increase in the B-field. The material has reached the point of magnetic saturation. When H is reduced back down to zero, the curve will move from point "a" t ...
... (B+). At point "a" almost all of the magnetic domains are aligned and an additional increase in the magnetizing force will produce very little increase in the B-field. The material has reached the point of magnetic saturation. When H is reduced back down to zero, the curve will move from point "a" t ...
AP Physics III.E
... Lenz’s Law – the induced emf resulting from changing magnetic flux leads to an induced current whose direction is such that the induced magnetic field opposes the direction of the original flux change. ...
... Lenz’s Law – the induced emf resulting from changing magnetic flux leads to an induced current whose direction is such that the induced magnetic field opposes the direction of the original flux change. ...
phys1444-spring06-032006
... – The direction of the field is the direction the north pole of a compass would point to – The number of lines per unit area is proportional to the strength of the magnetic field – Magnetic field lines continue inside the magnet – Since magnets always have both the poles, magnetic field lines form c ...
... – The direction of the field is the direction the north pole of a compass would point to – The number of lines per unit area is proportional to the strength of the magnetic field – Magnetic field lines continue inside the magnet – Since magnets always have both the poles, magnetic field lines form c ...
Seminar Report
... energy — and therefore a frequency — which depends on the energy absorbed while the field was active. It is this relationship between field-strength and frequency that allows the use of nuclear magnetic resonance for imaging. An image can be constructed because the protons in different tissues retur ...
... energy — and therefore a frequency — which depends on the energy absorbed while the field was active. It is this relationship between field-strength and frequency that allows the use of nuclear magnetic resonance for imaging. An image can be constructed because the protons in different tissues retur ...
Electrical Energy and Magnetism
... The north pole of a compass points in the direction of the magnetic field This direction is always away from a north magnetic pole and toward a south magnetic pole ...
... The north pole of a compass points in the direction of the magnetic field This direction is always away from a north magnetic pole and toward a south magnetic pole ...
Electricity and Magnetism
... Electricity and magnetism are two aspects of the same force. All magnets have both north and south poles Static electricity is manifest as a force between charged objects ...
... Electricity and magnetism are two aspects of the same force. All magnets have both north and south poles Static electricity is manifest as a force between charged objects ...
the magnetic field
... (a) Using the small compasses, determine what the North Magnetic Pole direction is and indicate it by drawing an arrow. Use more than one compass because some of the small (cheap!) compasses don’t always work properly. Compare your results with other tables. Be careful to keep away from other magnet ...
... (a) Using the small compasses, determine what the North Magnetic Pole direction is and indicate it by drawing an arrow. Use more than one compass because some of the small (cheap!) compasses don’t always work properly. Compare your results with other tables. Be careful to keep away from other magnet ...
Facts About Magnets and Magnetism
... Circular magnets do not have poles, instead, the magnetism runs in a circle.. They are used in large computers. Disk magnets have one pole around the edge and the other in the center. They are used in speakers. Cylindrical magnets are used in electric meters and to hold objects in place on machines. ...
... Circular magnets do not have poles, instead, the magnetism runs in a circle.. They are used in large computers. Disk magnets have one pole around the edge and the other in the center. They are used in speakers. Cylindrical magnets are used in electric meters and to hold objects in place on machines. ...
Basics of Electricity and Magnetism
... If we impose the boundary condition V (0) = 0, then V0 = 0. We will be interested in material media that can be classified as conductors or dielectrics. Conductors contain free electrons which are under the influence of an electric field can flow freely through conductors. So, conductors admit the f ...
... If we impose the boundary condition V (0) = 0, then V0 = 0. We will be interested in material media that can be classified as conductors or dielectrics. Conductors contain free electrons which are under the influence of an electric field can flow freely through conductors. So, conductors admit the f ...
File
... magnetic field strength due to a long wire that carries a current of 6.0 A at a point 1.0 cm away from the wire? [1.2 x 10-4 T] ...
... magnetic field strength due to a long wire that carries a current of 6.0 A at a point 1.0 cm away from the wire? [1.2 x 10-4 T] ...
Document
... CT –1 Cosmic rays (atomic nuclei stripped bare of their electrons) which come from all directions, would continuously bombard Earth’s surface if most of them were not deflected by Earth’s magnetic field. Given that Earth is, to an excellent approximation, a magnetic dipole, the intensity of cosmic ...
... CT –1 Cosmic rays (atomic nuclei stripped bare of their electrons) which come from all directions, would continuously bombard Earth’s surface if most of them were not deflected by Earth’s magnetic field. Given that Earth is, to an excellent approximation, a magnetic dipole, the intensity of cosmic ...
Chapter 6 - Bonding in Metals
... Big-picture perspective: Metals and alloys are essential to modern technologies, especially as electrical conductors, structural materials, and magnets. We will find that these unique properties arise from the atomic and electronic structures of metals. Most metalsand alloys have relatively simple c ...
... Big-picture perspective: Metals and alloys are essential to modern technologies, especially as electrical conductors, structural materials, and magnets. We will find that these unique properties arise from the atomic and electronic structures of metals. Most metalsand alloys have relatively simple c ...
Magnet
A magnet (from Greek μαγνήτις λίθος magnḗtis líthos, ""Magnesian stone"") is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, and attracts or repels other magnets.A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An everyday example is a refrigerator magnet used to hold notes on a refrigerator door. Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include iron, nickel, cobalt, some alloys of rare earth metals, and some naturally occurring minerals such as lodestone. Although ferromagnetic (and ferrimagnetic) materials are the only ones attracted to a magnet strongly enough to be commonly considered magnetic, all other substances respond weakly to a magnetic field, by one of several other types of magnetism.Ferromagnetic materials can be divided into magnetically ""soft"" materials like annealed iron, which can be magnetized but do not tend to stay magnetized, and magnetically ""hard"" materials, which do. Permanent magnets are made from ""hard"" ferromagnetic materials such as alnico and ferrite that are subjected to special processing in a powerful magnetic field during manufacture, to align their internal microcrystalline structure, making them very hard to demagnetize. To demagnetize a saturated magnet, a certain magnetic field must be applied, and this threshold depends on coercivity of the respective material. ""Hard"" materials have high coercivity, whereas ""soft"" materials have low coercivity.An electromagnet is made from a coil of wire that acts as a magnet when an electric current passes through it but stops being a magnet when the current stops. Often, the coil is wrapped around a core of ""soft"" ferromagnetic material such as steel, which greatly enhances the magnetic field produced by the coil.The overall strength of a magnet is measured by its magnetic moment or, alternatively, the total magnetic flux it produces. The local strength of magnetism in a material is measured by its magnetization.