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4.1 The Concepts of Force and Mass
4.1 The Concepts of Force and Mass

4.1 The Concepts of Force and Mass
4.1 The Concepts of Force and Mass

Strong field dynamics in high-energy heavy-ion
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... placed near the north pole of a second magnet, the two magnets repel. This can be summarized by stating that “like poles repel.” In contrast, you found that when the north pole of one magnet is placed near the south pole of a second magnet, the two magnets attract. This can be summarized by stating ...
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... Two issues arise from the discussion above. Firstly, what does a negative sign for E actually mean? Secondly, is there a way in which we can teach students to use the minus sign in order to predict the direction of the induced current? This article deals with the second point first, since this is of ...
Electromagnetic Induction
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... (a) A curent from A to B is increasing in magnetude. What is the direction of induced current, if any in the loop shown in Fig. (b) If inslead of current it is an electron, what will happen ? Answer : (a) When current in the wire AB increases, the flux linked with the loop (which is out of the page) ...
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... the coil. This tells us that the direction of motion of the magnet (or coil) determines the direction of flow of current in the wire. By moving the magnet in and out rapidly, we can set up an alternating current in the wire. As we have just seen, moving a conductor in a magnetic field will generate ...
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LAB COURSE: 253B/255B FALL 2014

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PDF - York Technical College

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... non-magnetic substances. They include copper, aluminum, glass and plastic. Pure oxygen exhibits magnetic properties when cooled to a liquid state. Attraction : When two magnets or magnetic objects are closed to each other, there is a force that attracts the poles together. Force attracts N to S. Mag ...
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... We cannot usually see or otherwise perceive electrical and magnetic fields, but their strength can be measured. The field intensity depends on the voltage present (electrical field) or the electric current (magnetic field), but is also highly dependent on the distance between the field and the sourc ...
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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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