Ewing’s molecular theory of magnetism, Other Engineering

Assignment Help:

Ewing’s molecular theory of magnetism

Every molecule of a magnetic substance behaves as a tiny magnet called molecular magnet.
In an unmagnetized state the molecular magnets in the iron- bar are randomly distributed as N and S poles pointing in all possible directions so that the net orientation becomes zero.
When the iron bar is magnetized with the help of a magnet, the molecular magnets arrange themselves in an orderly way. The order is due to the pointing of all the N- poles of individual in one direction and all S-poles in the opposite direction. This state of magnetisation is shown in the fig.
In side the magnetized iron bar the N- Poles of each elementary magnet is coupled to S-pole of the next magnet and so on. However there are free N-poles at one end and free S-poles at the other end. These free poles make the iron bar as a whole magnet with two (N-S) poles. These two poles are the points where N and S poles of the molecular magnets are left free or uncoupled.
Repetition of the process of magnetisation only allows the maximum alignment among the molecular magnets. This means the magnetisation of the iron bar cannot be increased further. This limit of magnetisation of a substance is called magnetic saturation.
When the magnetized iron bar is cut into number of smaller and smaller pieces, each piece continues to act as a magnet. By extension of this logic, this means that the smallest possible piece is also a magnet.
Magnetic poles always exists in pairs, two poles have equal strength. since any magnet consists of two poles, a magnet is also called magnetic dipole.
Magnetism of a magnet can be destroyed by tapping, hammering, heating etc.

Related Discussions:- Ewing’s molecular theory of magnetism

flow solver, Flow Solver The flow solver of FP utilises data produced ...

Flow Solver The flow solver of FP utilises data produced by the grid generator, together with data read from an input file named FLOW.DAT, and proceeds to calculate the solutio

Flow at low mach number and zero incidence about m6 wing, Flow at low Mach ...

Flow at low Mach number and zero incidence about M6 wing Results from FP were obtained corresponding to M ∞ = 0.2 and a = 0 and, as noted, with the input files generated by FP

Research paper, You will research an issue relating to money and banking. Y...

You will research an issue relating to money and banking. You will write an eight- to 10-page paper discussing your research, in depth. You will also need to relate your research t

Aero Performance Problem, Given data for an F-4 (W=40000 lb, S=530 ft^2, Ta...

Given data for an F-4 (W=40000 lb, S=530 ft^2, Ta@sea level=35800 lb, Mach=1.5, h=20000 ft (std day), Cd0=.0224, k=.1516) find aircraft''s specific excess power in straight-and-lev

Working of bootstrap sweep circuit, Working of bootstrap sweep circuit?

Working of bootstrap sweep circuit?

Degeneracy , If a single energy eigen value corresponds to more than one ei...

If a single energy eigen value corresponds to more than one eigen function then degeneracy is said to be exist and the number of wave function associated with a single value of ene

Flight control - estimators for control, Estimators for control: App...

Estimators for control: Applying control by the state itself needs transducers measuring each componentof x. If instead we apply control using the estimate of state (as prov

Corporate, Need help with a timed exam

Need help with a timed exam

Gas turbines, factors affecting engine performance

factors affecting engine performance

..introduction to networking, Explain bus topology and peer to peer network...

Explain bus topology and peer to peer network concepts

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages