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Waves - Department of Physics, USU
Waves - Department of Physics, USU

... • Electric motors (AC and DC) are very common: Magnitude of torque is proportional to current flowing. Uses: car starter motor; vacuum cleaners; current meters • AC motors run at a fixed speed. • DC motors have adjustable speed (depending on applied voltage. ...
Magnetic Properties - Help, Science!
Magnetic Properties - Help, Science!

Page 1 - Madeley High School
Page 1 - Madeley High School

... This plug contains a transformer. There are 4600 turns on its primary coil and 200 turns on its secondary coil. The plug is used on the mains supply and has a potential difference (p.d.) of 230 V across its primary coil. Use the equation in the box to calculate the p.d. across the secondary coil of ...
The Tangent Galvanometer
The Tangent Galvanometer

... produced by that current with the earth's magnetic field. Using an ammeter together with a tangent galvanometer, we can compute the earth's magnetic field. The magnetic field at the center of a coil of N circular turns, each of radius R and carrying a current I, has a magnitude μ NI Bc = 0 2R in whi ...
Investigation of Electric Reactor Magnetic Field using Finite Element
Investigation of Electric Reactor Magnetic Field using Finite Element

Important Questions
Important Questions

... i. What is the direction of force on each arm? ii. What is the effect of the forces on the coil? iii. How is the effect of forces on coil changed if the terminals of battery are interchanged? 20. What is overloading of domestic electric circuit? What precautions should be taken to avoid such overloa ...
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1 - אתר מורי הפיזיקה

File - Help, Science!
File - Help, Science!

Physics 2102 Spring 2002 Lecture 15
Physics 2102 Spring 2002 Lecture 15

Hassan_Magnetic_Motor_HW6 - Stevens Institute of Technology
Hassan_Magnetic_Motor_HW6 - Stevens Institute of Technology

DENSITY MEASUREMENT IN THE RANGE OF 1 Hz TO 20... A PRECISION CALIBRATION SET-UP FOR AC MAGNETIC FLUX Po Gyu Park
DENSITY MEASUREMENT IN THE RANGE OF 1 Hz TO 20... A PRECISION CALIBRATION SET-UP FOR AC MAGNETIC FLUX Po Gyu Park

Faraday`s Law of Electromagnetic Induction
Faraday`s Law of Electromagnetic Induction

... This electromotive force acts as the driving force for the current induced in the closed circuit C, and Faraday’s law states that this emf results from any change in the magnetic flux linking that circuit. Notice that the mathematical expression (3) of Faraday’s law is a statement of an independent ...
Final Examination
Final Examination

... of difficulty (D, C, B, A). The highest-level question that is answered correctly determines the grade for the topic. For 85% of the topics (17) you must answer at least one question properly. For each grade you need to answer 60% of the questions (12) on the appropriate level. ...
Models of Simple Iron Cored Electromagnets
Models of Simple Iron Cored Electromagnets

... to zero at the selected boundaries. As other default nodes it inherits its selection from “Magnetic Field (mf)” parent node. Thus, all boundaries are selected, but insulation is not applicable to the boundaries constituting the coil and the core. Only the sphere is insulated and magnetic potential ...
On Electron Paramagnetic Resonance in DPPH
On Electron Paramagnetic Resonance in DPPH

Physics 2102 Lecture 19
Physics 2102 Lecture 19

... • Induced emf must be in a direction that OPPOSES this change. • So, induced emf must be in same direction as current ...
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Lecture_14_mod

... 29-5 Back EMF and Counter Torque; Eddy Currents Induced currents can flow in bulk material as well as through wires. These are called eddy currents, and can dramatically slow a conductor moving into or out of a magnetic field. ...
Basic Instruments and Measurements
Basic Instruments and Measurements

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Electrical circuits wyklad 6

CHARACTERISATION OF HARD MAGNETIC MATERIALS
CHARACTERISATION OF HARD MAGNETIC MATERIALS

Understanding Solid State Physics Additional Questions
Understanding Solid State Physics Additional Questions

... 3. Describe your vision for the future of solar power. 4. Medical applications of solid state physics. 5. Congratulations! You’ve been given $1million USD to develop an innovative product or device based on one of the theories discussed in this book. What do you develop and why? Suggested length 200 ...
AP Physics Daily Problem #140
AP Physics Daily Problem #140

07magnet_field_s2012rev
07magnet_field_s2012rev

Topic 6 Powerpoint Slides
Topic 6 Powerpoint Slides

< 1 ... 93 94 95 96 97 98 99 100 101 ... 153 >

Magnetic core

A magnetic core is a piece of magnetic material with a high permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices such as electromagnets, transformers, electric motors, generators, inductors, magnetic recording heads, and magnetic assemblies. It is made of ferromagnetic metal such as iron, or ferrimagnetic compounds such as ferrites. The high permeability, relative to the surrounding air, causes the magnetic field lines to be concentrated in the core material. The magnetic field is often created by a coil of wire around the core that carries a current. The presence of the core can increase the magnetic field of a coil by a factor of several thousand over what it would be without the core.The use of a magnetic core can enormously concentrate the strength and increase the effect of magnetic fields produced by electric currents and permanent magnets. The properties of a device will depend crucially on the following factors: the geometry of the magnetic core. the amount of air gap in the magnetic circuit. the properties of the core material (especially permeability and hysteresis). the operating temperature of the core. whether the core is laminated to reduce eddy currents.In many applications it is undesirable for the core to retain magnetization when the applied field is removed. This property, called hysteresis can cause energy losses in applications such as transformers. Therefore, 'soft' magnetic materials with low hysteresis, such as silicon steel, rather than the 'hard' magnetic materials used for permanent magnets, are usually used in cores.
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