the molecules of magnet also have the property of magnet.
just like if we break a magnet into many pieces all will have the same north south directions.
✭ The area that is surrounding a magnet where we can feel the effect of the magnet is called as Magnetic Field.
✭ We shall place a magnet on a cardboard and then randomly sprinkle iron filings around it. So when we tap lightly on the cardboard we may observe that the iron filings arrange them in a specific manner. Then trace lines along these pattern. We will observe that when we take and place a magnetic compass at place it on the trace we took we may observe that the north pole of the magnet correctly aligns it towards the lines. These lines we traced are called the Magnetic Lines.
✭ The places where the field lines are dence will have a strong magnetic force at that place.Ans as the distance between the lines widen the magnetic force reduces.
✭ Magnetic Fields don't intersect each other.
✭ If we break a magnet into the parts then it will form two seperate magnets with each part having their own north & south poles.
✭ And even if we break and break and break this stays the same even after breaking to its molecular level.
✭ Each molecule of a magnet is an independent substance.This hold true for both magnetized and non magnetized ones and these tiny magnets are called as Molecular Magnet.
✭ In a unmagnetized state these molecular magnets will be arranged in a random manner and due to this there will be no magnetic effect.
✭ Whereas in a magnetized substance these molecular magnets gets arranged in a proper order.The south poles in one and the north pole in the opposite direction. So a magnetic force gets created.
✭ When all the molecular magnets get perfectly aligned it is called as Point of saturation.
✭ After we reach this point fo saturation trying to increase the strength of thr magnet doesn't help.
»» Ewing's theory did not explain why molecules of a non magnetic substance does not show magnetic behaviour
»» Ewing's theory did not explain why the individual molecules of a magnetic substance say iron behave like a tiny magnet
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Molecular theory of magnetism describes every magnetic substance as being a collection of dipoles that are initially in a state where there is no specific and uniform orientation as a result of the application of a magnetic field and because of this the net magnetic field strength of the substance becomes zero.
the molecules also have the properties of magnet just like if we break a magnet bar into many pieces each pieces have north south directions.
This theory was first advanced by Weber in 1852 and was, later on, further developed by Ewing in 1890. The basic assumption of this theory is that molecules of all substances are inherently magnets in themselves, each having N and S pole.
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The basic points of the theory are as follows:
Each molecule of a magnetic substance is a complete magnet.
In an un-magnetised substance the molecular magnets are arranged randomly and form closed chains. Hence, the magnetic effect of any one of them is cancelled by its neighbour. So the entire bar does not exhibit any net magnetic property with distinct N and S poles.
Randomly Arranged Molecular Magnets
When a substance is magnetised, all the tiny molecular magnets arrange themselves in parallel lines. As a result one end becomes the north pole and the other becomes the south pole.
Magnetic Domains Aligned in NS Direction
When this magnetised substance is heated or hammered, the molecular magnets get kinetic energy and the straight chains get disturbed and the molecules go back to the original random distribution, thus losing the magnetic properties.
I hope it may help you ❤️❤️❤️
In an un-magnetised substance the molecular magnets are arranged randomly and form closed chains. Hence, the magnetic effect of any one of them is cancelled by its neighbour.
HOPE IT HELPS YOU
Molecular Theory of Magnesium ...
The basic points of the theory are as follows :
Each molecule of magnetic substance is complete magnet. In an un-magnetised substance the molecular magnets are arranged randomly and form closed chains. Hence, the magnetic effect of any one of them is callanced by its neighbor.