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प्रश्न
State two ways of magnetising an iron piece?
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उत्तर
The two ways of magnetising an iron piece are:
1. Magnetic induction method:
Take a long iron nail and test it for magnetic properties by bringing near the magnetic substances. You will see nail does not attract the magnetic substances. Now bring near a pole of a bar magnet to the head of the nail. Now bring the iron paper clips near the pointed end of the nail, you will observe that the iron paper clips now get attracted towards the nail. This is because the iron nail has become a magnet. Now take the bar magnet away from the iron nail, paper clips fall off. This magnetism is temporary.
2. Single touch method:
Take a demagnetised piece of iron. Place it on a stable surface. Take a magnet and select its one pole. Now MB it with the selected pole on the iron in one direction several times. After some time, the iron piece turns into a magnet.
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संबंधित प्रश्न
State three uses of an electromagnet?
Answer the following in short.
Name a few common appliances that use electromagnets.
State two factors on which the strength of induced e. m.f. depends.
Why is soft iron generally used as the core of the electromagnet?
State the condition when an electric charge can give rise to a magnetic field.
State two advantages of an electromagnet over a bar magnet.
What will be the effect on the working of an electric bell if instead of a direct current an alternating current is used?
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
What are the factors that govern the magnitude of force acting on a current carrying conductor which is freely suspended in a magnetic field?
(i) A straight wire conductor passes vertically through a piece of cardboard sprinkled with iron filings. Copy the diagram and show the setting of iron filings when a current is passed through the wire in the upward direction and the cardboard is tapped gently. Draw arrows to represent the direction of the magnetic field lines.
(ii) Name the law which helped you to find the direction of the magnetic field lines.
