SUMMARY Magnetic levitation is the process of levitating an object by exploiting magnetic fields. If the magnetic force of attraction is used‚ it is known as magnetic suspension. If magnetic repulsion is used‚ it is known as magnetic levitation. In the past‚ magnetic levitation was attempted by using permanent magnets. Earnshaw’s theorem however‚ proves that this is mathematically impossible. There exists no arrangement of static magnets of charges that can stably levitate an object. There
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The physical basis of the transformer is mutual induction between two circuits linked by a common magnetic field. Transformer is required to pass electrical energy from one circuit to another‚ via the medium of the pulsating magnetic field‚ as efficiently and economically as possible. This could be achieved using either iron or steel which serves as a good permeable path for the mutual magnetic flux. An elementary linked circuit is shown in Fig.1. The principle of operation of this circuit can be explained
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electric and magnetic fields. Electromagnetism is defined the interaction between a magnetic field and an electric field. People use electromagnetic to transmit electricity to other place‚ to supply electricity form magnetic fields and to store and conserve energy. Electromagnet has components of strong interaction‚ weak interaction and gravitational. According to Hans Christian Ørsted that electricity and magnetism are linked. He proved that an electric current produces a magnetic field as it flows
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AUTONOMA DE COAHUILA FACULTAD DE SISTEMAS DC Motors Catedrático: Ing. Gustavo Mendoza Leal Alumno: Alfredo Valdés Cárdenas Introduction A DC motor is a type of electrical machine that converts direct current into mechanical power by means of a magnetic field. DC motors are widely used in field applications because of their many advantages over AC motors such as speed control‚ high starting torque‚ quick starting‚ stopping‚ reverse and acceleration and free from harmonics found in AC. Applications
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Due to Increasing Flux Learning Goal: To work through a straightforward application of Faraday’s law to find the EMF and the electric field surrounding a region of increasing flux Faraday’s law describes how electric fields and electromotive forces are generated from changing magnetic fields. This problem is a prototypical example in which an increasing magnetic flux generates a finite line integral of the electric field around a closed loop that surrounds the changing magnetic flux through a surface
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Circular motion‚ gravitational field‚ and oscillation 1.Define gravitational field strength: Force per unit mass 2. Explain why there is a point between two point masses at which the gravitational field strength is zero. Because gravitational fields of two masses are in opposite directions‚ so there is a point where it is zero What is meant by angular velocity The rate of change of the angular displacement of an object as it moves along curved path. Generally when asked to test
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Ibrahim Shahl 3 AC winding design The windings used in rotating electrical machines can be classified as Concentrated Windings • All the winding turns are wound together in series to form one multi-turn coil • All the turns have the same magnetic axis • Examples of concentrated winding are – field windings for salient-pole synchronous machines – D.C. machines – Primary and secondary windings of a transformer Distributed Windings • All the winding turns are
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caring conductor is placed in magnetic field then a force is generated on current caring conductor. F = BIL. Sinθ If all three B and L are Perpendicular to each other‚ then F = BIL If a conductor is moving in magnetic field then an EMF is generated in a conductor . E = BVL. Sinθ E = BVL If B is Perpendicular to V Basic Principles For magnetic field density (B): 1. Magnetic Fields: Direction of Field: North South 2. Electro Magnetic Fields: - Current caring conductor
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looking out for highly energetic gamma rays‚ as some has been found recently. The astronomers do know‚ however‚ that these gamma rays did not come from the same origin as the cosmic waves‚ as the gamma rays did not deflect off of the Milky Way’s magnetic field. Though they haven’t found the origin of these rays yet‚ astronomers are on the right path to get there. If it takes months‚ or years‚ they won’t rest until answers are given‚ thus expanding our small intergalactic knowledge. This article
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happens to the distribution of magnetic flux lines when the iron ring was placed in between the U-magnets? Magnetic Flux‚ by definition‚ is the measure of the quantity or the strength of the magnetic force in a given area‚ whether a closed or an open area. When the iron ring is placed in between the U-magnets‚ there has been a region by which has been enclosed‚ following the area of the iron ring. And according to Gauss’s Law for magnetism‚ the total magnetic flux on a closed area is equal to zero
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