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

Determine the i-v characteristic of the network, Determine the i-v characte...

Determine the i-v characteristic of the network shown in Figure by the use of breakpoint analysis.

Which stack is used in 8086, FIFO (First in First Out) stack is used in 808...

FIFO (First in First Out) stack is used in 8086.In this type of Stack the first stored information is retrieved first.

Name the materials used in case of bimetals, Name the materials used in cas...

Name the materials used in case of Bimetals and give reasons. Bimetals : Alloy of nickel and iron along with low value of coefficient of thermal expansion are utilized as

Magnetic circuits, develop and explain series and parallel magnetic circuit...

develop and explain series and parallel magnetic circuits?

Explain limit signal spectrum to prevent aliasing, Explain Limit Signal Spe...

Explain Limit Signal Spectrum to Prevent Aliasing? The sampling frequency should at least be two times that of the highest frequency in the incoming signal to avoid aliasing. T

Determine line voltage for the y- connected machine, A 3-phase, 16-pole syn...

A 3-phase, 16-pole synchronous machine is driven by a prime mover at a speed of 600-rpm with the stator open circuited. The rotor flux per pole is 0.025-Wb. Determine (a) the fr

Develop and execute a p spice program, Q. In the circuit shown in Figure th...

Q. In the circuit shown in Figure the switch opens at t = 0. Develop and execute a P Spice program to solve for v(t), and use PROBE to obtain a plot of v(t). Hint: Use the follo

Design a signal generator, Aims Exploring the analog output capabili...

Aims Exploring the analog output capabilities of the PIC trainer Write PIC assembly code to implement a simple multi-function signal generator Equipment PIC Trainer

Machines 1, diagram of armeture reaction

diagram of armeture reaction

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