Practical Activity – Lenz’s Law Syllabus: 2.7‚ 2.5‚ 2.6 Aim – What is the effect of Lenz’s law? How does Lenz’s Law work? Risk Rating Minimisation 1. Skin pinched by magnet Low Don’t bring the magnets together and don’t try and hold them apart. Don’t try and separate the rare earth magnets. 2. Hit by swung pole Low When holding the pipe‚ make sure the it is perpendicular to the ground and keep clear of any surrounding people Procedure – 1. Collect a 1m plastic‚ metal and another metal
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heard of other people’s supernatural experiences such as a ghost possessed and near-dead experience but only few of you experienced on your own. So why and how it can happen? III. Explanation A. The existence of the human magnetic field B. The proximity of the magnetic oscillation frequency C. Energy conversion Transition: You may think that what I’ve told you are just crapping. Believe it or not‚ now I’m going to tell you some true stories that happened from my friends. III. True story at:
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CBSE Sample Paper-05 (Unsolved) SUMMATIVE ASSESSMENT –I SCIENCE (Theory) Class – X Time allowed: 3 hours Maximum Marks: 90 General Instructions: a) All questions are compulsory. b) The question paper comprises of two sections‚ A and B. You are to attempt both the sections. c) Questions 1 to 3 in section A are one mark questions. These are to be answered in one word or in one sentence. d) Questions 4 to 6 in section A are two marks questions. These are to be answered in about 30 words
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couplings of which‚ however‚ are still under discussion. Here we present results of the longitudinal elastic constant c22 down to 80 mK and magnetic fields up to 12 T. c22 reveals clear signatures of the magnetic energy scales involved and discloses distinct anomalies at the Néel ordering TN = 1.88 K. Based on measurement as a function of temperature and magnetic field‚ a detailed B-T phase diagram is mapped out which includes an additional phase boundary of unknown origin at low temperature (T < 0.5
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Walter Meissner and Robert Ochsenfeld discovered a magnetic phenomenon that showed that superconductors are not just perfect conductors. Figure 3 illustrates a thought experiment that highlights this difference. Imagine that both the ideal conductor and superconductor are above their critical temperature‚ Tc. That is‚ they both are in a normal conducting state and have electrical resistance. A magnetic field‚ Ba‚ is then applied. This results in the field penetrating both materials. Both samples are then
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and practice of science as religion‚ he was motivated to find a connection that would link different scientific fields. Although the actual discovery was an accident‚ Oersted was on the right track. He had all the right materials and the right general idea. One afternoon Hans Christian Oersted was attempting to demonstrate to his students that moving charges did not make a magnetic field. Oersted had planned to demonstrate this by showing the heating of a wire by an electric current. He also wanted
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Deflection magnetometer - tan A‚ tan-B and verification of inverse square law Aim : To compare the magnetic moment of the two bar magnets using equal distance method and null deflection methods using a deflection magnetometer in tan - A position Apparatus : Deflection magnetometer‚ bar magnets Formula: (a) Equal distance method M1 / M2 = tan(θ1) / tan(θ2) where tan(θ1) and tan(θ2) are the average of deflections due to bar magnets M1 and M2 respectively (b) Null deflection magnetometer
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by heating at constant pressure to the boiling point‚ or else by reducing the pressure at constant temperature. Plasma - Like a gas‚ plasma does not have definite shape or volume. Unlike gases‚ plasmas are electrically conductive‚ produce magnetic fields and electric currents‚ and respond strongly to electromagnetic forces. Positively charged nuclei swim in a "sea" of freely-moving disassociated electrons‚ similar to the way such charges exist in conductive metal. In fact it is this electron "sea"
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caring conductor is placed in magnetic field then a force is generated on current caring conductor. F = BIL. Sinθ If all three B and L are Perpendicular to each other‚ then F = BIL If a conductor is moving in magnetic field then an EMF is generated in a conductor . E = BVL. Sinθ E = BVL If B is Perpendicular to V Basic Principles For magnetic field density (B): 1. Magnetic Fields: Direction of Field: North South 2. Electro Magnetic Fields: - Current caring conductor
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induced there are two types of tachogenerators: 1. DC tachogenerator 2. AC tachogenerator PRINCIPLE It operates on the principle of Faraday’s Laws of Electromagnetic induction . It states that whenever there is a relative motion between the magnetic field and a conductor ‚ then the voltage is generated in that conductor. Characteristic requirements of tachogenerator: Accuracy: The input to the tachogenerator is
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