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प्रश्न
Name one device that uses an electromagnet.
उत्तर
Electric bell
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संबंधित प्रश्न
Why is soft iron used as the core of the electromagnet in an electric bell?
The strength of the electromagnet can be increased by
Name the material used for preparing an electromagnet.
You are required to make an electromagnet from a soft iron bar by using a cell, an insulated coil of copper wire and a switch.
- Draw a circuit diagram to represent the process.
- Label the poles of the electromagnet.
The following figure shows a coil wound around a soft iron bar XY.
- State the polarity at the ends X and Y as the switch is pressed.
- Suggest one way of increasing the strength of electromagnet so formed.
Show with the aid of a diagram how a wire is wound on a U-shaped piece of soft iron in order to make it an electromagnet. Complete the circuit diagram and label the poles of the electromagnet.
Name the material used for making the armature of an electric bell. Give a reason for your answer.
Explain, why steel is used in preference to soft iron for making permanent magnets while soft iron is used in preference to steel for making electromagnets.
Unlike magnetic poles ______ whereas like poles ______.
Explain the working of the following device.
Magnetic levitation trains.
