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प्रश्न
A coil of insulated copper wire is wound around a piece of soft iron and current is passed in the coil from a battery. What name is given to the device so obtained? Give one use of the device mentioned by you.
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उत्तर
The device formed is an electromagnet.
Use:
For separating the magnetic substances such as iron from other debris.
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संबंधित प्रश्न
Name one device that uses an electromagnet.
Electromagnets are made up of :
How is an electromagnet made? Name two factors on which the strength of magnetic field of the electromagnet depends.
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.
State two differences between an electromagnet and a permanent magnet.
Name the material used for making the armature of an electric bell. Give a reason for your answer.
What is an electroscope? Describe the different stages of charging a gold leaf electroscope negatively with the help of a diagram.
Unlike magnetic poles ______ whereas like poles ______.
Explain the working of the following device.
Magnetic levitation trains.
