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Lecture 17 - Louisiana State University Physics & Astronomy
Lecture 17 - Louisiana State University Physics & Astronomy

Lecture 19: Magnetic properties and the Nephelauxetic effect
Lecture 19: Magnetic properties and the Nephelauxetic effect

... electrons are magnetically dilute, and so the unpaired electrons in one atom are not aligned with those in other atoms. However, in ferromagnetic materials, such as metallic iron, or iron oxides such as magnetite (Fe3O4), where the paramagnetic iron atoms are very close together, they can create an ...
Temas Selectos de Física
Temas Selectos de Física

... coil of the electric motor rotates an unlimited number of turns. __________ The electrical resistance of an electrical circuit with three resistors connected in parallel is greater than the resistance of an electrical circuit with the same three resistors connected in series. ...
Topic 5 , 10-11 New Selected Problems 2 - Solutions
Topic 5 , 10-11 New Selected Problems 2 - Solutions

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9.2 Oersted`s experiment

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Lecture 15

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Magnetic field of the earth OBJEctiVE gEnEral
Magnetic field of the earth OBJEctiVE gEnEral

... plane in such a way that its needle points to 0° when parallel to the horizontal component 0°. An additional horizontal magnetic field BHH, which is perpendicular to Bh, is generated by a pair of Helmholtz coils and this field causes the compass needle to turn by an angle β. According to Fig. 1 the ...
Magnetic Effects due to Electric Currents Result:
Magnetic Effects due to Electric Currents Result:

... • Force is proportional to product of both currents. • Force is inversely proportional to distance (r) between wires. • Force is proportional to length (l) of wires. • Force is attractive when currents in same direction and repulsive if current in opposite direction. • Example: Determine force betwe ...
History of Magnetism - School of Applied Non
History of Magnetism - School of Applied Non

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Experiment - TerpConnect

... surface. Electrical currents generate magnetic fields, similar to the way that electrical charges generate electric fields. The magnitude of the magnetic field generated depends of the specific geometry of the wire in which the current is flowing, and sometimes in a complicated way, but for a given ...
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February 2011

... – More mechanically robust – Magnet losses can be an issue (not shielded by rotor iron); reduce by segmenting magnets axially or radially or increasing magnet resistivity ...
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5. Capacitance & Inductor

... •When the potential different is same as the voltage of the battery, the entering of charges stop. •Charges are stored in the capacitor plates after the connection to the battery is disconnected. •Ratio of Q:V is constant and is called as capacitance, thus ...
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Magnetic Fields And Right Hand Rules

TOPIC 6.3: Magnetic Fields and Forces
TOPIC 6.3: Magnetic Fields and Forces

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solution

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phys1444-lec15

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Preview of Period 17: Induction Motors and Transformers
Preview of Period 17: Induction Motors and Transformers

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magnetic field

... current-carrying wire loop. Electric motors use a commutator to change the direction of the current in the loop. Alternating current electric motors do not use commutators. ...
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Electromagnetism: Home

... way? The magnetic field increased because you increased the number of coils, and thus, the ...
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Electricity and its Effects

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Physics Talk

ER Week17, Magnetism
ER Week17, Magnetism

... o Electromagnet: An electromagnet is a coil wound around typically an iron or steel core. When current flows through it, the core becomes magnetized. o Demonstration running current through a conductor in one direction then in the ...
A 100-turn coil of area 0.1 m 2 rotates at half a revolution per second
A 100-turn coil of area 0.1 m 2 rotates at half a revolution per second

... Q.20. Explain, why high frequency carrier waves are needed for effective transmission of signals. A message signal of 12 kHz and peak voltage 30 V. calculate the (i) modulation index (ii) side-band frequencies. Q.21. Distinguish between unpolarised and plane polarized light. An unpolarised light is ...
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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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