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It has been known for a thousand years or more (originating in China) that certain (magnetic) materials would always orientate themselves in a particular direction if suspended to rotate freely. The very earliest experiments in magnetism were done with these materials (permanent magnets) and these clearly showed that two pieces of these materials were able to exert some force at a distance. This force is analogous to gravitational force. We know from our own experience that it exists. Physicists theorise on the causes whilst engineers are more concerned with being able to measure the practical effect and put it to use by devising a suitable method of analysis.Very early experiments by Oersted and Ampere showed that a current carrying conductor also had an effect on magnetic material in its vicinity. Magnetic compasses placed near to a current carrying conductor were deflected. He also found that the direction of deflection depended on the position relative to the wire. Those above the wire were deflected in the opposite direction to those placed below. Ampere quantified the strength of this force in terms of the current and the distance involved. In order to be able to relate these observations to analysis, the concept of a magnetic field was introduced.The presence of a magnetic field may be visualised by drawing imaginary continuous lines of 'magnetic flux', the density of which is a measure of the strength of the field in a given material. Arrows are added to the flux lines to indicate the direction of the magnetic field, from which the direction of the force it produces on, for example, compass needles and current carrying conductors can be deduced. Convention has it that the magnetic field strength is denoted by the symbol H (ampere.turns), whilst magnetic flux density is given the symbol B (Webers/m2).
Write a brief note on MMX technology. MMX (Multimedia extensions) technology adds 57 new types of instructions to the Pentium - 4 microprocessors instruction set. The MMX tech
Q. Briefly Explain Energy and Power? If a charge dq gives up energy dw when going from point a to point b, then the voltage across those points is defined as v = dw/dq If
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Molecular Chain (MIT, Princeton, Colorado) Consider a one-dimensional chain consisting of N molecules which exist in two configurations, α, β, with corresponding energies and
explain the operation principle
purpose of sheilding
Analog-to-Digital (A/D) Converters An A/D converter converts analog input signals into digital output data in many areas such as process control, aircraft control, and telemetr
i need to submit a still model or a working model on science day(28 February). can you help me....
Hello, I have some questions pertaining to electromagnetic induction. Could you please give me a hand? Thanks. If we increase the speed of the bar magnet slowly from 0 to 8, and
Classify the different types of insulating materials with reference to their limiting safe temperatures for use. On the basis of insulating materials and their limiting safe te
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