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प्रश्न
Since every iron atom is a tiny magnet, why are not all iron bar magnets?
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उत्तर
Each molecule of a magnetic substance is an independent magnet. But in an unmagnetised iron piece, molecular/ atoms (tiny magnets) are not arranged in any order and hence they neturalise the magnetic forces of each other As a result, any unmagnetised iron piece can not behave as a magnet.
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संबंधित प्रश्न
State two properties of a bar magnet ?
Explain the meaning of the term magnetic field ?
Define the following term regarding a bar magnet:
Effective length
With whom should I pair up?
| Group 'A' | Group 'B' |
| (a) Compass | 1. The highest magnetic force |
| (b) The door of a cupboard | 2. Like poles |
| (c) Repulsion | 3. A magnet |
| (d) Magnetic pole | 4. A magnetic needle |
Give scientific reason:
Two steel needles hanging from the lower end of a vertical bar magnet do not hang vertically.
Differentiate between:
Primary and secondary cell.
State the laws of magnetism.
Which is not attracted by a magnet?
Match the following:
| 1. | Electricity and magnetism | a. | Step-down transformer |
| 2. | Force on the conductor | b. | Hans Christian Oersted |
| 3. | Electric bell | c. | I LB |
| 4. | Ns <Np | d. | Electromagnet |
