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PY2T10 Electricity and Magnetism Dr. Charles Patterson
PY2T10 Electricity and Magnetism Dr. Charles Patterson

Evolution of Electromagnetics in the 19th Century
Evolution of Electromagnetics in the 19th Century

... filings and he considered them as physical as light rays. Because such lines connect magnetic poles of opposite polarity, they appeared to convey the attractive force like rubber strings. On the other hand, adjacent lines ending to magnetic poles of the same polarity act as tubes under pressure tend ...
division - IRIS - Lake Land College
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... Course Outcomes: At the successful completion of this course, students will be able to: ...
Electromagnetism Worksheets
Electromagnetism Worksheets

... An electromagnet consists of a solenoid (soil of wire) wrapped around a bar of iron or other ferromagnetic material. When current flows through the solenoid, it gives it a magnetic field like a bar magnet. The magnetic field of the solenoid magnetizes the ferromagnetic bar by aligning its magnetic d ...
Maxwell`s Equations
Maxwell`s Equations

... a. In what direction does the induced electrical field point? Let the current on the central wire be in the +z direction. In the quasistatic approximation (current changes slowly), the magnetic field is circumferential. A changing magnetic field in this direction is analogous to the current for a s ...
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hit the ground running

phys1444-lec23
phys1444-lec23

Earnshaw`s Theorem and Magnetic Levitation
Earnshaw`s Theorem and Magnetic Levitation

... The inverse square law inherent in the Biot-Savart law is by virtue of the Coulomb force solution to the E vector, and based on the inverse square law of the Coulomb force, it is traditionally assumed that the inverse square law can be extrapolated throughout electromagnetic forces generally. We are ...
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1 - Nuts and Volts

Power point - Physics 420 UBC Physics Demonstrations
Power point - Physics 420 UBC Physics Demonstrations

Chapter 20
Chapter 20

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chapter20

... As the coil begins to rotate, the induced back emf opposes the applied voltage The current in the coil is reduced The power requirements for starting a motor and for running it under heavy loads are greater than those for running the motor under average loads ...
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Name Class Date Review for Electricity and Magnetism Test Units

... Vocabulary Matching: Match the key term in the column on the right with its definition on the left. __________ 1. Device that changes mechanical energy into electrical energy. __________ 2. Process by which a material can be made into a magnet __________ 3. Temporary magnet made by wrapping a curren ...
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October 16/17th Induction and Inductance

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PH213GeneralPhysicsCalculus_CrsOutline2012

LEP 4.1.06 Current balance / Force acting on a current
LEP 4.1.06 Current balance / Force acting on a current

... alternating voltage output of the power unit via an ammeter, a switch and a bridge rectifier. For the first two parts of the experiment, a fixed voltage of 12 V a. c. is selected and the associated current IM in the coils is measured. The conductor loops are connected via two light flexible metal st ...
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phys1444-fall11

Magnetism - HSphysics
Magnetism - HSphysics

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In-Class Worksheet on Displacement and Velocity

Tuesday, Dec. 6, 2011 - UTA HEP WWW Home Page
Tuesday, Dec. 6, 2011 - UTA HEP WWW Home Page

... –  The current I enclosed in the loop passes through the surface #1 –  However the surface #2 that shares the same closed loop do not have any current passing through it. •  There is magnetic field present since there is current  In other words there is a changing electric field in between the plat ...
unit 4 physics index book 1 — electric power
unit 4 physics index book 1 — electric power

... An electric charge that moves through a magnetic field experiences a force. This force is always perpendicular to both the magnetic field and the direction of motion of the charge. The charge need not be moving at right angles to the magnetic field but, if it is, then the force is at its maximum. Us ...
lec27
lec27

... The equation is called Gauss’ law for magnetism, and is one of Maxwell’s four equations. It also says there is no such thing as a magnetic monopole. Some quantum theories suggest that magnetic monopoles might exist. We have not found them. If we do, then the right hand side of the equation above wil ...
Welcome to Physics 220! - BYU Physics and Astronomy
Welcome to Physics 220! - BYU Physics and Astronomy

Questions:
Questions:

... #1.) Which of the following statements are true? i. Electric field lines are always perpendicular to potential field equipotential lines. ii. The more closely spaced the equipotential lines are, the greater the potential. iii. The more closely spaced the electric field lines are, the stronger the el ...
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Eddy current

Eddy currents (also called Foucault currents) are circular electric currents induced within conductors by a changing magnetic field in the conductor, due to Faraday's law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. They can be induced within nearby stationary conductors by a time-varying magnetic field created by an AC electromagnet or transformer, for example, or by relative motion between a magnet and a nearby conductor. The magnitude of the current in a given loop is proportional to the strength of the magnetic field, the area of the loop, and the rate of change of flux, and inversely proportional to the resistivity of the material.By Lenz's law, an eddy current creates a magnetic field that opposes the magnetic field that created it, and thus eddy currents react back on the source of the magnetic field. For example, a nearby conductive surface will exert a drag force on a moving magnet that opposes its motion, due to eddy currents induced in the surface by the moving magnetic field. This effect is employed in eddy current brakes which are used to stop rotating power tools quickly when they are turned off. The current flowing through the resistance of the conductor also dissipates energy as heat in the material. Thus eddy currents are a source of energy loss in alternating current (AC) inductors, transformers, electric motors and generators, and other AC machinery, requiring special construction such as laminated magnetic cores to minimize them. Eddy currents are also used to heat objects in induction heating furnaces and equipment, and to detect cracks and flaws in metal parts using eddy-current testing instruments.
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