Batch: 10 Roll: Sh-099 Introduction The basic theory on a ballistic galvanometer starts with torque associated with a current carrying loop. A brief review of ordinary moving coil galvanometer is presented followed by the effects of transient currents. This paves the way for a detailed analysis of ballistic galvanometer. Torque on a Current Loop It is well known that a current loop behaves like a magnetic dipole. The magnitude
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flux that occurred when the battery was connected and disconnected.[1] Within two months‚ Faraday found several other manifestations of electromagnetic induction. For example‚ he saw transient currents when he quickly slid a bar magnet in and out of a coil of wires‚ and he generated a steady (DC) current by rotating a copper disk near the bar magnet with a sliding electrical lead ("Faraday’s disk").[8] Faraday explained electromagnetic induction using a concept he called lines of force. However‚ scientists
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1. Motors use the effect of forces on current-carrying conductors in magnetic fields Discuss the effect on the magnitude of the force on a current-carrying conductor of variations in: The strength of the magnetic field in which it is located • The magnitude of the force is proportional to the magnetic field strength. Thus‚ an increase in magnetic field strength will cause an increase in the force on the wire and a decrease in magnetic field strength will cause a decrease in force on the
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into which the coils are wound. | The armature carries the rotor coils. The armature is the part of a DC motor that rotates and provides energy at the end of the shaft. It is basically an electromagnet | Rotor coil(s) | There may be only one‚ in a very simple motor‚ or several coils‚ usually of several turns of insulated wire‚ wound onto the armature. The ends of the coils are connected to bars on the commutator. | The coils provide torque‚ as the current passing through the coils interacts with
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Introduction to AC Machines Dr. Suad Ibrahim Shahl 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
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form a flat coil with a single radius R‚ the magnetic field resembles the pattern of a short bar magnet‚ and at the center of the coil its magnitude is B=N. The direction of the magnetic field at the center of the wire loop can be determined with the help of RIGHT-HAND-RULE. If the thumb of the right hand is pointed in the direction of the current and the curled fingers are placed at the center of the loop‚ the fingers indicate the direction of the magnetic field. For a square coil equation (1)
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constructing mass solar plants. It is important to try and improve upon the existing technology of solar power production as a means of clean and renewable energy. I believe that this is possible through the optimization of transformer coils by testing efficiencies of varying coil materials to determine greatest voltage transfer. Transformers are imperative to energy production
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that when a copper pick-up coil is placed inside a solenoid whose magnetic field varies with time‚ current will flow in this coil even if there is no voltage source physically connected to it. This kind of induced emf is seen everywhere in the modern world in the propagation of light and radio waves‚ in transformers and generators‚ or in induction coils that give the spark for the car engine. The induced emf is proportional to the number of turns Nc in the “pick-up” coil and is related to the rate
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Determining the Effectivity of Lanzones Peels as Mosquito Coil Against Its Commercial Counterparts An Investigatory Project Presented to: MS. AILENE HIJARA A Faculty of Science Department Statefields School‚ Inc. In Partial Fulfillment of the Requirements for CHEMISTRY by: CAMILLE FAYE MULI JINN DINN ORLANDA JOHN RHEY MITRA RIGEL KENT RENDON JONAS TRISTAN TAGUIBAO August 2013 Chapter I “The Problem and Its Setting” Background of the Study Mosquitoes have been
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induced emf or voltage in a coil is proportional to the rate of change of magnetic flux through a coil‚ this is shown blew: Ƹ= -dɸ/dt Equation 6.1 The flux of the magnetic field is defined and the following: ɸ=BAcosΘ Equation 6.2 B is the magnetic field at the location of the coil. A is the cross sectional area of the coil‚ and Θ is the angle between the field and the area A. There is several different ways to create a changing flux though the coil. An easy way is to use
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