Basic electromagnetic principles, Electrical Engineering

Assignment Help:


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).


Related Discussions:- Basic electromagnetic principles

Power of the signal transmitted by powerful cell phones, What is the power ...

What is the power of the signal transmitted by powerful cell phones? Ans) The powerful cell phones can transfer a signal of 3 watts.

Resistivity materials, explain the properties and the application of high r...

explain the properties and the application of high resistivity materials related with tunsten and carbon?

Find fmax for circuit, Q. (a) An audio amplifier with R i = 10 k, R o ...

Q. (a) An audio amplifier with R i = 10 k, R o = 0, and ¯A(ω), as shown in Figure (a), is used in the circuit shown in Figure with R S = 1 k,R L = 16 , and C = 0.2 µF. Sk

Find the t- domain forced response, Consider an RLC series circuit excited ...

Consider an RLC series circuit excited by v(t) = Ve st in the time domain. Assume no initial capacitor voltage or inductive current at t = 0. Draw the transformed network in the s

Motoring mode of rotating machines, Q. Motoring mode of rotating machines? ...

Q. Motoring mode of rotating machines? The motoring mode has electric power input and mechanical power output. The electromagnetic torque Te drives the machine against the load

Transformers, Three transformers are provided with the following rating val...

Three transformers are provided with the following rating values: 1) 2400/240 V, 55kVA, Req1 = (0.1 + 0.0Y) Ohm and Xeq1 = (0.15 + 0.XX) Ohm. 2) 240/120 V, 25kVA, Req1 = (0.1

Multiprogramming - single processor one users many program, Multiprogramm...

Multiprogramming - Single Processor one Users  Many  Programs When single  processor is  used to execute more than  one independent program simultaneously the technique  is ca

Thunderstrom detector, Ask question #how to construct thunderstrom detector...

Ask question #how to construct thunderstrom detector with circuit breaker.

Show the direct connection or one to one topology, Q. Show the Direct conne...

Q. Show the Direct connection or one to one topology? In the one to all topology, there is a path between every node and every other node. The number of paths required is defin

Derive the expression for steady state error, Derive the mathematical expre...

Derive the mathematical expression for steady state error of first order system with unit ramp signal. Discuss the following - proportional cum integral control - proporti

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd