Explain magnetic fields and magnetic field lines. Also explain Swing's molecular theory of magnetism with it's drawback.
Answers
✭ 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.
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✭ 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.
Drawback
»» 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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