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प्रश्न
State briefly the molecular theory of magnetism.
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उत्तर
- Each molecule of a magnetic substance, whether it is magnetized or unmagnetized, is an independent magnet.
- In a magnetized substance, the molecules are arranged in an order so as to produce an external effect. In this order, all the north poles of the molecules of the magnetized substances point to one direction and all their south poles point to a direction opposite to that to which their north poles points.
- In an unmagnetized substance, the molecules are not arranged in any order, so they neutralize the magnetic forces of each other.
- The molecular theory of magnetism was a considerable step forward but later there came an electrical explanation for the magnetism of atoms.
Atoms consist of negatively charged particles (electrons) that revolve around the positively charged nucleus. Electrical current loops are formed in an atom due to the circulation of these electrons. Each current loop behaves a magnetic dipole and hence produce a magnetic field. Also, electrons are also spinning like tops and this adds further magnetism to the atom.
संबंधित प्रश्न
State whether the following statement is true of false:
The axis of earth's imaginary magnet and the geographical axis coincide with each other.
Draw a diagram to show the magnetic field lines around a bar magnet.
Explain why, a freely suspended magnet always points in the north-south direction.
Fill in the following blank with suitable words:
The lines of ........... round a straight current-carrying conductor are in the shape of ...........
A thick wire is hanging form a wooden table. An anticlockwise magnetic field is to be produced around the wire by passing current through this wire by using a battery. Which terminal of the battery should be connected to the:
(a) top end of wire?
(b) bottom end of wire?
Give reason for your choice.
Explain the following :
Several soft iron pins can cling, one below the other, from the pole of a magnet.
What do you understand by the term magnetic field lines?
How do you account for the following fact?
Soft iron keepers help to prevent the magnets from losing their magnetic properties.
Draw diagram showing the arrangement of the lines of force for two magnets in line, with unlike poles facing one another.
The relative strength of the magnetic field at a point in the space surrounding the magnet is shown by the ____________.
