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20.4 Force on Electric Charge Moving in a Magnetic Field The force
20.4 Force on Electric Charge Moving in a Magnetic Field The force

Lecture 15
Lecture 15

Electromagnetic Induction Faraday`s Law
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... It is often easier to take the absolute value of Farady’s Law to find the magnitude of the induced emf and use Lenz’s Law to find the direction of the induced current that results. ...
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... 5.P.5A.1 Use mathematical and computational thinking to describe and predict the motion of an object (including position, direction, and speed). 5.P.5A.2 Develop and use models to explain how the amount or type of force (contact and non-contact) affects the motion of an object. 5.P.5A.3 Plan and con ...
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... a) The current in the loop is clockwise and constant. What is the direction of the magnetic field at P? The current in the loop now alternates (CW, then CCW, then CW, etc.) b) What is the direction of the EM wave at the indicated point? c) What is the polarization direction of the magnetic field por ...
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... Circles of Magnetism A compass allows us to observe the direction of a magnetic field: compass needles are just little magnets that are free to rotate. Normally, compasses respond to Earth’s magnetic field, orienting themselves parallel to magnetic field lines. If we create a magnetic field that is ...
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Digital Design - Oakland University

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IB Physics SL Y2 @ RIS – Unit 13, Magnetism: Faraday`s Lab

... completely random. If the arrangement of the material results in random electron motions, the magnetic fields of all of the moving electrons cancel out. The more strongly the electron motions of the molecules are oriented in the same direction, the more strongly magnetic a material will be. Magnets ...
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No Slide Title

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di/dt - s3.amazonaws.com

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Magnetism and electromagnetism How are magnetic poles

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Magnetic Torch - (EU

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generators and transformers

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Are Electricity and Magnetism Related? 1 - WW

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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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