Unit 4 Electrical Principles and Technologies - Topic 6
... The idea for the first electric generators dates back to a discovery by Hans Christian Oersted and André-Marie Ampère in 1820. They noticed a relationship between electricity and magnetism. Oersted observed that a compass needle turned when it was near a wire carrying electric current. The amount of ...
... The idea for the first electric generators dates back to a discovery by Hans Christian Oersted and André-Marie Ampère in 1820. They noticed a relationship between electricity and magnetism. Oersted observed that a compass needle turned when it was near a wire carrying electric current. The amount of ...
Unit 4 Electrical Principles and Technologies
... The idea for the first electric generators dates back to a discovery by Hans Christian Oersted and André-Marie Ampère in 1820. They noticed a relationship between electricity and magnetism. Oersted observed that a compass needle turned when it was near a wire carrying electric current. The amount of ...
... The idea for the first electric generators dates back to a discovery by Hans Christian Oersted and André-Marie Ampère in 1820. They noticed a relationship between electricity and magnetism. Oersted observed that a compass needle turned when it was near a wire carrying electric current. The amount of ...
PowerPoint 演示文稿 - Shandong University
... If the gyroscope is tipped, the gimbals will try to reorient to keep the spin axis of the rotor in the same direction. If released in this orientation, the gyroscope will precess in the direction shown because of the torque exerted by gravity on the gyroscope. ...
... If the gyroscope is tipped, the gimbals will try to reorient to keep the spin axis of the rotor in the same direction. If released in this orientation, the gyroscope will precess in the direction shown because of the torque exerted by gravity on the gyroscope. ...
forces_CW_wwtbam
... The south pole of a magnet is attracted to which pole of a second magnet? A B ...
... The south pole of a magnet is attracted to which pole of a second magnet? A B ...
Lesson 17 Magnetism
... same way in the two wires, the force is attractive When the currents go opposite ways, the force is repulsive ...
... same way in the two wires, the force is attractive When the currents go opposite ways, the force is repulsive ...
Thermodynamics of finite magnetic two-isomer systems
... Berry,14 due to its physical similarity to those in infinite systems. We investigated the nature of the transition in our system by inspecting the temperature dependence of the bimodal distribution, shown in Fig. 1, following a procedure outlined in Refs. 15–17. This analysis revealed the transition ...
... Berry,14 due to its physical similarity to those in infinite systems. We investigated the nature of the transition in our system by inspecting the temperature dependence of the bimodal distribution, shown in Fig. 1, following a procedure outlined in Refs. 15–17. This analysis revealed the transition ...
Lecture Notes 17: Multipole Expansion of the Magnetic Vector Potential, A; Magnetic Multipoles; B = Curl A
... The Magnetic Quadrupole Moment Tensor (in terms of discrete magnetic charges): # discrete magnetic charges ...
... The Magnetic Quadrupole Moment Tensor (in terms of discrete magnetic charges): # discrete magnetic charges ...
PHYS 4202/6202 (as of Jan. 03/2015) Electricity and Magnetism II
... MS: Magnetic field of a straight current (quick derivation from Maxwell’s 4th equation) MM: Ampere’s hypothesis MS: Magnetic dipole moment of a plain loop with current MS: Magnetic dipole moment of an orbiting electron in the H-atom MS: Some simple estimates MECH: Review of work, energy, Work-kineti ...
... MS: Magnetic field of a straight current (quick derivation from Maxwell’s 4th equation) MM: Ampere’s hypothesis MS: Magnetic dipole moment of a plain loop with current MS: Magnetic dipole moment of an orbiting electron in the H-atom MS: Some simple estimates MECH: Review of work, energy, Work-kineti ...
Lecture 17a - University of Hawaii Physics Department
... More Applications of Magnetic Induction • Magnetic Levitation (Maglev) Trains – Induced surface (“eddy”) currents produce field in opposite direction Repels magnet Levitates train e.g. Shanghai maglev train S N “eddy” current ...
... More Applications of Magnetic Induction • Magnetic Levitation (Maglev) Trains – Induced surface (“eddy”) currents produce field in opposite direction Repels magnet Levitates train e.g. Shanghai maglev train S N “eddy” current ...
Ch 8 Magnetism and Its Uses: Section 1 Magnetism
... B. Magnetic poles—the regions of a magnet where the magnetic force exerted by the magnet is strongest 1. All magnets have a north pole and a south pole. 2. Like poles attract. Unlike poles repel. 3. Earth has magnetic poles. a. A compass needle is a small bar magnet that can freely rotate. b. A comp ...
... B. Magnetic poles—the regions of a magnet where the magnetic force exerted by the magnet is strongest 1. All magnets have a north pole and a south pole. 2. Like poles attract. Unlike poles repel. 3. Earth has magnetic poles. a. A compass needle is a small bar magnet that can freely rotate. b. A comp ...
Faraday Disk
... electromagnetism and presents his interpretation thereof in early 1821. Besides confirming Oersted's results, Ampere made careful studies of the effects of electric currents on one another. He found that if currents traveled in the same direction along two parallel wires, there was attraction betwee ...
... electromagnetism and presents his interpretation thereof in early 1821. Besides confirming Oersted's results, Ampere made careful studies of the effects of electric currents on one another. He found that if currents traveled in the same direction along two parallel wires, there was attraction betwee ...
Chapter 28 Sources of Magnetic Field
... magnetic field due to this current at (a) points outside the conductor (r > R) and (b) points inside the conductor (r < R). Assume that r, the radial distance from the axis, is much less than the length of the wire. (c) If R = 2.0 mm and I = 60 A, what is B at r = 1.0 mm, r = 2.0 mm, and r = 3.0 mm? ...
... magnetic field due to this current at (a) points outside the conductor (r > R) and (b) points inside the conductor (r < R). Assume that r, the radial distance from the axis, is much less than the length of the wire. (c) If R = 2.0 mm and I = 60 A, what is B at r = 1.0 mm, r = 2.0 mm, and r = 3.0 mm? ...
B - college physics
... Click to see each of the following: Effective current of electrons Magnetic force on electron Charge separation in rod Orientation of electric field Electric force on electrons ...
... Click to see each of the following: Effective current of electrons Magnetic force on electron Charge separation in rod Orientation of electric field Electric force on electrons ...
LAB: Building the Best Electromagnet
... 1. Confirm that the nail is not magnetic by attempting to use it to pick up paper clips. 2. Insert the nail into the thin-wire coil with the least number of turns. 3. Count and record the number of turns of wire in this coil. 4. Connect the wire to the single battery terminals with your jumper wires ...
... 1. Confirm that the nail is not magnetic by attempting to use it to pick up paper clips. 2. Insert the nail into the thin-wire coil with the least number of turns. 3. Count and record the number of turns of wire in this coil. 4. Connect the wire to the single battery terminals with your jumper wires ...
Ferrites and accessories - ETD 39/20/13 - Core and
... 1. Some parts of this publication contain statements about the suitability of our products for certain areas of application. These statements are based on our knowledge of typical requirements that are often placed on our products in the areas of application concerned. We nevertheless expressly poin ...
... 1. Some parts of this publication contain statements about the suitability of our products for certain areas of application. These statements are based on our knowledge of typical requirements that are often placed on our products in the areas of application concerned. We nevertheless expressly poin ...
Unit 11: Magnetism - Science Learning Space1
... The magnetic field probably comes from the moving electrons in the currents of the Earth’s molten core. The Earth has a north and a south magnetic pole which is different from the geographic north and south pole. Electricity is a flow of electrons. A flow of electrons creates a magnetic field. Magne ...
... The magnetic field probably comes from the moving electrons in the currents of the Earth’s molten core. The Earth has a north and a south magnetic pole which is different from the geographic north and south pole. Electricity is a flow of electrons. A flow of electrons creates a magnetic field. Magne ...
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.