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प्रश्न
Electromagnets are made up of :
विकल्प
steel
copper
soft iron
aluminium
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उत्तर
Electromagnets are made up of : soft iron
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संबंधित प्रश्न
Why is soft iron used as the core of the electromagnet in an electric bell?
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.
State two ways through which the strength of an electromagnet can be increased.
Why is soft iron used as the core of the electromagnet in an electric bell?
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.
Explain in detail the application of electromagnets.
Unlike magnetic poles ______ whereas like poles ______.
Assertion (A): When 2 long parallel wires, hanging freely are connected in parallel to a battery, they come closer to each other.
Reason (R): Wires carrying current in opposite directions repel each other.
Explain the working of the following device.
Magnetic levitation trains.
