Magnetic permeability and the definition of the amp, Electrical Engineering

Assignment Help:

The ampere has been defined (by the International Committee of Weights and Measures in 1946) as the current flowing in two long parallel wires 1 metre apart that produces a force of 2 x 10-7 Newtonsper metre length between the wires.

1884_magnetic permeability.png

So with the same current flowing in both wires spaced 1 metre apart, it is easy to increase the current until a force of 2 x 10-7 Newtons is measured between them. We then know that the current flowing is exactly 1 amp (by definition). This definition also gives the value of k = 2 x 10-7  Newtons.metre/amp

If we express one of the currents in terms of the magnetic field that it produces, then we obtain an equation for the force per metre lengthexperienced by a current carrying conductor in a magnetic field. This is by far the most useful form of the equation in practice:

897_magnetic permeability1.png

Since   k = 2 x 10-7  then we write the new constant as  µwhere

µ0 =  4π x 10-7 Henrys/metre  

(note the Henry is a unit of measure of inductance

µ0 is known as the magnetic permeability of free space


Related Discussions:- Magnetic permeability and the definition of the amp

Carry flag - sub subtract instruction , Carry Flag CY is  reset  as e...

Carry Flag CY is  reset  as explained  above.  ( in chapter 1 we have  sen in the 2 complement  methods of subtraction that  the carry  is set  when the result is positive. He

Can you explain honorarium?, Can you explain Honorarium? Ans: Honora...

Can you explain Honorarium? Ans: Honorarium is a remuneration for work performed which is intermittent or occasional in character and either so laborious or of such special

Input characteristics - power semiconductor devices , Input Characteristics...

Input Characteristics Transistors  can be  operated in the switching  mode. If  base  current IB  is zero transistor is in  an ON  state  behaves as a switch. If  the base  cur

Microcontroller, What are usue and all the details of 8051 microcontroller ...

What are usue and all the details of 8051 microcontroller with its block diagram pin diagram and all other details

Mesh-current equation with controlled sources, Since a controlled source ac...

Since a controlled source acts at its terminals in the same manner as does an independent source, source conversion and application of KCL and KVL relations are treated identically

What is the desirable properties of an insulation material, What is the des...

What is the desirable properties of an insulation material? Insulation materials have the desirable properties are as follows: 1. Very fine dielectric strength such as of mi

#titleElectromagnetic Induction, Hello, I have some questions pertaining t...

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

What is the basic working of decoders, Q. What is the basic working of Deco...

Q. What is the basic working of Decoders? An n-bit binary code is capable of encoding up to 2 n distinct elements of information. A decoder is a combinational network that decode

What is error-rate control, Q. What is error-rate control? A system is ...

Q. What is error-rate control? A system is said to possess error-rate damping when the generation of the output in some way depends upon the rate of change of the actuating sig

State the advantages of expert systems, State the Advantages of expert syst...

State the Advantages of expert systems -  Never "forgets" to ask a question in determining the logic -  provides consistent answers - Less skilled work force needed, ther

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