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प्रश्न
You are given an iron nail, a torch cell, and a long piece of insulated copper wire. With the help of a labelled neat diagram, describe in steps how you will make the nail, an electromagnet.
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उत्तर
Aim: To make an electromagnet.
Materials Required: An iron nail, a battery, a switch, some insulated copper wire, and some iron paper pins.
Procedure: Coil the insulated copper wire around the iron nail. Connect the ends of the wire to the battery through the switch. Close the switch so that electric current flows through the copper wire. Now bring the iron paper pins close to the iron nail.
Observation And Conclusion: The paper pins get attracted to the nail, showing that the nail has turned into an electromagnet. Now, if you switch off the current, the iron paper pins will drop off the iron nail.
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संबंधित प्रश्न
The diagram shows a coil wound around a U-shaped soft iron bar AB.
- What is the polarity induced at the ends A and B when the switch is pressed?
- Suggest one way to strengthen the magnetic field in the electromagnet.
- What will be the polarities at A and B if the direction of current is reversed in the circuit?
Suppose you are given a long bar magnet and you are asked to break it into four small magnets. Draw diagrams showing the polarities of each broken part.
State three uses of an electromagnet?
Name the material used for making the armature of an electric bell. Give a reason for your answer.
What is an electric motor?
State two factors on which the strength of induced e. m.f. depends.
State the purpose of the iron core.
Why is soft iron generally used as the core of the electromagnet?
What is a permanent magnet? Give one use of it.
What will be the effect on the working of an electric bell if instead of a direct current an alternating current is used?
