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Part - Saraswathi Velu College of Engineering
Part - Saraswathi Velu College of Engineering

... 2. Derive an expression for the electric field due to a straight uniformly charged wire of length ‘L’ in meters and with a charge density of +λ c/m at the point p which lies along the perpendicular bisector of wire. (10) 3. State and prove Gauss’s law. Describe any two applications of Gauss’s law?(1 ...
Physics 203 Sample Exam 1
Physics 203 Sample Exam 1

... (a) constant electric and magnetic fields. (b) oscillating electric and magnetic fields in the same direction. (c) electric and magnetic fields at various angles. (d) oscillating electric and magnetic fields at right angles. [8] Magnetic fields can be produced by (a) electric currents (b) changing e ...
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... An isolating transformer has THE SAME number of turns on the primary and secondary coil. The mains supply is hidden in an isolating transformer. The output terminals are NOT live so there is no danger of you getting electrocuted if you touch them with wet hands. An ordinary circuit is not used becau ...
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phy_1304 - WordPress.com

... 12)Draw magnetic field lines when a diamagnetic and paramagnetic substance is placed in an external magnetic field and write one difference between its in terms of magnetic susceptibility. 13) Two long straight parallel conductors X and Y , carrying steady currents I1 and I2 in the same direction a ...
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Magnetism - Cloudfront.net

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... magnets were permanent "horseshoe" magnets similar to those sold in toy shops-now very strong electro-magnets are used, the electricity generated being passed through coils wound on, but insulated from, soft iron, so as to produce magnets of much greater strength than would otherwise exist. Apart fr ...
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Magnetism - a magnet has polarity. It has 2 ends. A north seeking

... switch constantly produce current in second coil. ⇒vary the magnetic field. To do this, we need an alternating current. The current produced by an AC generator provides a means for the current to be turned on and off without manually operating a switch. Faraday’s iron ring is a TRANSFORMER. • The vo ...
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Today • Questions re: Magnetism problems 2 • HW: Magnetism

... field strength will increase by some number that is associated with iron (for Iron, k = 200). In essence, by filling the space with a magnetic material, you effectively increase the strength of the Electromagnet. ...
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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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