Electrophoresis Electrophoresis is a method to separate body substances; this technique isolates them by placing the sample in an electric field. This phenomenon was first observed in 1807 by Reuss from Moscow State University who noticed that a constant electric field caused clay particles dispersed in water to migrate. It is caused by the presence of charges of the surface of the particle and the surrounding fluid. This was perfected in 1937 by Arne Tiselius (1902-1971). It is used in forensic
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Name Electric Fields Go to http://phet.colorado.edu/simulations/sims.php?sim=Electric_Field_Hockey and click on Run Now. 1. You rub balloons in your hair and then hang them like in the picture below. Explain why you think they move apart and what might affect how far apart they get. They move apart due to the fact they get charged when rubbing them on your hair and the same charge is on both balloons. The more you rub them on your hair the more charged they will become making
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The Lincoln Electric Case International Strategic Management By: Group 4A Introduction John C. Lincoln founded the Lincoln Electric Company in the year 1895. The first products that the company produced and sold were electric motors that he had designed himself. A Few years later‚ in 1907 his brother James‚ a recently graduate from the Ohio State University‚ joined as a senior manager; He was also the one who would introduce different and very innovative human resource policies
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STATIC ELECTRIC FIELDS 9 Introduction to Co-ordinate System-Rectangular-Cylindrical and Spherical Co-ordinate system-Introduction to line‚ Surface and Volume Integrals-Definition of Curl‚ Divergence and Gradient-Meaning of Strokes theorem and Divergence theorem. Coulomb’s Law in Vector Form – Definition of Electric field Intensity-Principle of Superposition-Electric field due to discrete charges-Electric field due to continuous charge distribution-Electric field
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Irodov Problem 3.7 As shown in Figure 1‚ the charges are located in at the four corners of the square ABCD whose diagonal is of length 2l. Since the point Xis located at a height of x units from the plane of ABCD along its central axis‚ the distance of X from any of the corners A‚B‚C and D is . The electric field strengths due to each of the four charges located at corners A‚B‚C and D are given by‚ The vertical components of EC and EB will cancel
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An electric field surrounds electrically charged particles and time-varying magnetic fields. The electric field depicts the surrounding force of an electrically charged particle exerted on other electrically charged objects. The concept of an electric field was introduced by Michael Faraday. The electric field is a vector field with SI units of newtons per coulomb (N C−1) or‚ equivalently‚ volts per metre (V m−1). The SI base units of the electric field are kg⋅m⋅s−3⋅A−1. The strength or magnitude
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Physical Science Review Waves‚ Sound and Light Waves- What are Waves? 1. 1 .The substance that a move through is called a medium. 2. True or False: Particles are squeezed together during rarefactions. 3. True or False: Waves that require a medium through which to travel are called electromagnetic waves. 4. True or False: The matter in the medium moves perpendicular to a transverse wave. 5. What medium is often used to transfer computer information? Optic Fibers 6. 6 .A
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VAN DE GRAAFF GENERATOR This is a machine that can build up high voltages of the order of a few million volts. The resulting large electric fields are used to accelerate charged particles (electrons‚ protons‚ ions) to high energies needed for experiments to probe the small scale structure of matter. Principle 1. Skin effect 2. Electrostatic induction 3. Action of points Construction A hollow metallic sphere A is mounted on insulating pillars as shown‚ and a pulley B is mounted at the centre
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lightning rod is a metal pole with a wire attached to it that runs from a high point in the building and down to the ground. They are used to prevent damage to buildings. Grounding static charges can help prevent sparks near flammable fuels. Paint sprayers work better if the object and the paint have different charges. Photocopiers use electrostatic principles in their operation. Grounding wires prevent damage to electrical equipment. Electrostatic precipitators work by creating charged waste
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Worksheet Electric charges and field 1. 1. An oil drop of 12 excess electrons is held stationary under a constant electric field of 2.55x104 v/m. The density of oil is 1.26 gm/cc. Estimate the radius of the drop.[Ans:1.428x10-6m] 2. Two small spheres each of mass 10-6kg are suspended from a point by silk threads 50 cm long. They are equally charged and repel to a distance of 20cm.Calculate the charge on each.[Ans:3.012x10-9C] 3. Two charges +20µC and -20µC are placed 20cm
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