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The Motor Effect
The Motor Effect

In a region of space, the magnetic field increases at a
In a region of space, the magnetic field increases at a

electric current
electric current

... because 7. What is a current that consists of charges that move back and forth in a circuit? 8. The relationship between electricity and magnetism is called 9. A generator uses motion in a magnetic field ...
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File

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Magnetism guide 2

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Chapter-36-four-square-questions_-answer

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Chapter 8 Section 2

... compass close to a wire with current flowing The compass needle deflected away from magnetic north when the current was turned on and returned when the current was turned off Hypothesis: magnetic field radiates in all directions from a wire carrying an electric current ...
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EM-UWA122B054T

... pointed left, the magnitude of the magnetic field at point B will increase. iii. [5 pts] With the second bar magnet in place, is the magnitude of the magnetic field at point A greater than, less than, or equal to that at point B? Explain. Magnetic field lines from a bar magnet tend to spread out as ...
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Magnetism - Fort Bend ISD

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Motion Along a Straight Line at Constant

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Physics_A2_37_GeneratingElectricity

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AC Circuits - Welcome | San Jose State University

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Standard EPS Shell Presentation

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Magnetism and Electromagnetism

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Power point on Magnetism - EMS Secondary Department

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Magnets and Electricity

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Magic Sand - studentorg

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Chapter 5 Electrostatics

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Chapter 5 Electrostatics

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Interactions between Electricity and Magnetism

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Magnetism

< 1 ... 106 107 108 109 110 111 112 113 114 ... 118 >

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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