magnetism? When two pieces of iron are attracted to each other by physical means or electrical means. 2. Torque is A. Strength that a motor produces by turning. 3. A magnetic field is D. All the above. 4. True or False: A permanent magnet is a piece of material that has been magnetized and can hold its magnetic strength for a reasonable length of time. True. 5. How is an electromagnet produced? Through electricity. 6. Which of the following produces the best electromagnet
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amount of noise. Such traits were the reason maglev trains should be competitive with airlines. Then again the extremely great prices and economic cost (In short term) did not let much creation around the world and limited it to one line in Shanghai. (Magnetic levitation train - Definition) Figure 2 (Electromagnetic Suspension) Figure 2 (Electromagnetic Suspension) Maglev trains mostly work on the different techniques and main principles of physics and magnetism. The first would be
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behind every single engineering advance. So – back to motors. What’s happening at the moment is very exciting. A new kind of motor has been developed which uses internal permanent magnets embedded within the rotor. These magnets improve the motors’ flux density and torque density. What does this mean? Well‚ for a start the motors use less energy – considerable less than traditional motors. This is because there is less heat loss. A side effect of this is that the machines using the new motors have
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passing an electrical current through a magnetic field creates a force. In an MHD propulsion system‚ a magnetic field is created within the hull‚ and sea water is used to conduct the electric current‚ as shown in the illustrations accompanying this story. The underlying principle is known as Fleming’s Left-Hand Rule‚ which is demonstrated by taking the thumb‚ index‚ and middle finger of the left hand and holding them perpendicular to each other. If a magnetic field is created in the direction of the
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Advanced Placement Program AP® Physics B Practice Exam The questions contained in this AP® Physics B Practice Exam are written to the content specifications of AP Exams for this subject. Taking this practice exam should provide students with an idea of their general areas of strengths and weaknesses in preparing for the actual AP Exam. Because this AP Physics B Practice Exam has never been administered as an operational AP Exam‚ statistical data are not available for calculating potential
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more comprehensive definition has been made by The Australian Archives Act 1983 in which they define records as physical object - a document (including any written or printed material) or object (including sound recording‚ coded storage device‚ magnetic tape or disc‚ microform‚ photograph‚ film‚ map or graphic work) that is‚ or has been‚ kept by reason of any information or matter that is contains or can be obtained from it or by reason of its connection with any event‚ person‚ circumstance or thing
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of their energy to one or other of the bulbs. Both bulbs obtain the full 1.5V potential difference of the battery‚ they are each normally bright. The effects of an electric current An electric current can cause 1. a heating effect 2. a magnetic effect 3. a chemical effect Measurement of electric current Electric current flowing through a component is measured in ampère‚ A‚ using an ammeter which is connected in series with the component. Electric current in a series
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answer: d In a magnetic circuit the magnetic field strength H is expressed in ampere turns/metre. H is calculated using the formula: a. H = I/nl b. H = nI/l c. H = Il/n d. H = nl/I answer: b The formula used to calculate the resistance (R) of a conductor‚ given its length (l)‚ cross sectional area a. and the constant of resistivity (p) a. R = pl/a b. R = a/pl c. R = pa/l d. R = al/p answer: b A simple alternator consists of a coil which is rotated in a permanent magnetic field. The emf
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current loop behaves like a magnetic dipole. The magnitude of the magnetic moment‚ associated with a current loop‚ equals the product of the area of the loop and the current flowing through it. Its direction is normal to the plane of the loop and is along the direction of advancement of a right handed screw rotated in the sense of current flow in the loop. It follows that for a current loop of area A‚ carrying an anticlockwise current of magnitude I‚ the equivalent magnetic moment is
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Physical Science Review Waves‚ Sound and Light Waves- What are Waves? 1. 1 .The substance that a move through is called a medium. 2. True or False: Particles are squeezed together during rarefactions. 3. True or False: Waves that require a medium through which to travel are called electromagnetic waves. 4. True or False: The matter in the medium moves perpendicular to a transverse wave. 5. What medium is often used to transfer computer information? Optic Fibers 6. 6 .A
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