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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).
PID controllers are popularly adopted in a wide range of industrial processes. The objective of this design practical is to study the way this PID controller changes system dynamic
Q. In a depletion MOSFET for which V P = 3 V and I DSS = 11mA, the drain current is 3mA when v DS is set at the largest value that will maintain ohmic region operation. Find v G
Question : (a) List the six basic quantities and units as used in the SI systems of units and give their respective symbols (b) A flux density in the CGS system is expressed
What is the main difference between 16 bit and 32 bit versions of C/C++ while using in line assembler. The 32-bit applications are written by using Microsoft Visual C/C++ for t
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Parallel Operation of Interconnected Synchronous Generators In order to assure continuity of the power supplywithin prescribed limits of frequency and voltage at all the load p
Electric circuits or networks are formed by interconnecting various devices, sources, and components. Although the effects of each element (such as heating effects, electric-?eld e
Q. Explain about Common Control? Common Control: Those systems in which the control subsystem is outside the switching network are known as common control switching system. Str
Explain the delay model based on logical effort often used in estimating delays in logic cells. Hence use the model to predict the delay of a 4-input NOR logic cell with a 3 times
Explain Ferrimagnetic magnetic materials. Ferrimagnetic Materials: In such materials unequal magnetic dipoles are lined up anti-parallel to each other. And permeabilities are
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