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

OSCILLATION, How we can findout phase angle from oscilloscope?

How we can findout phase angle from oscilloscope?

Isdn, Explain the meaning of numbering and addressing in ISDN network.

Explain the meaning of numbering and addressing in ISDN network.

Mechanical pulverization, Mechanical pulverization method is applicable to...

Mechanical pulverization method is applicable to brittle metals like antimony. Many varieties of mechanical pulverizers are in use; some of these have counter rotating plates or r

Accelerated Slipstream, Does the accelerated slipstream create more lift on...

Does the accelerated slipstream create more lift on part of a wing behind the propeller of a multa-engine aircraft? If so, about how much % for an Air King b200? Also the V-22 O

Visualizing data matlab, expertsmind.com has Visualizing Data solution in ...

expertsmind.com has Visualizing Data solution in matlab All the design features that are required to picture technological innovation and clinical information are available in

Edc, Combination clipper

Combination clipper

Guidance control system, Guidance Control system The control aspect...

Guidance Control system The control aspect of the guidance system is intended to stabilise the behaviour of the airframe. The fact that the guidance system will always h

Structures , how to find the equation for deflection of a cantilever beam s...

how to find the equation for deflection of a cantilever beam subjected to udl in terms of Airy''s stress function

Time-flow diagram, One approach of an intersection with fixed time traffic ...

One approach of an intersection with fixed time traffic signals, vehicles arrive at 500 veh/h on the approach. The cycle time of the intersection is 80 seconds, and the effective g

Routing sheet, routing sheet for rh shaft

routing sheet for rh shaft

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages