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chapter20
chapter20

AP Physics
AP Physics

... 5. A force F is applied to a conducting rod so that the rod slides with constant speed v over a frictionless pair of parallel conducting rails that are separated by a distance l. The rod and rails have negligible resistance, but the rails are connected by a resistance R, as shown below. There is a u ...
Chapter 25 - Senior Physics
Chapter 25 - Senior Physics

... One of the main properties of magnets is their ability to attract objects, chiefly those made of iron. Several naturally occurring minerals are magnetic. Any material able to keep its magnetic properties for a long time is called a permanent magnet. The English scientist Michael Faraday showed with ...
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... If we pull bar to right, the net magnetic flux in rectangle increases into screen, hence the I direction must induce opposite B field which is out of screen and is correct in drawing. Suppose Lenz’s law were reversed, then I would be reversed and F would go right and the bar would be accelerated to ...
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... __________ surrounding it and two magnetic ____________. • The magnetic poles are located on Earth’s _______________ where the magnetic force is _______________________. • They are located close to the ___________ poles but not exactly at them (about ______________ km off) • Because of this, a _____ ...
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... their reply to the above two comments, Koschny et al. have argued that what they retrieve are some “effective” parameters of a periodic structure which are wave vector dependent and that such parameters are not subject to the same constraints as those of homogeneous materials. Koschny et al. did not ...
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... 2. Use the Hall Sensor Probe to measure the magnetic field between the plates. This is your constant value of B. Calculate the area A, given that the inner diameter of the wire coil is 1.9 cm and the outer diameter is 3.1 cm. 3. Align the gap between the magnet poles so the coil wand will be able to ...
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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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