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प्रश्न
Why is soft iron used as the core of the electromagnet in an electric bell?
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उत्तर
The soft iron bar acquires the magnetic properties only when an electric current flows through the solenoid and loses the magnetic properties as the current is switched off. That's why soft iron is used as the core of the electromagnet in an electric bell.
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.
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.
State two ways through which the strength of an electromagnet can be increased.
State two advantages of an electromagnet over a permanent magnet.
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.
Explain in detail the application of electromagnets.
Explain the working of the following device.
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