Advertisements
Advertisements
प्रश्न
Name the material used for making the armature of an electric bell. Give a reason for your answer.
Advertisements
उत्तर
The material used for making the armature of an electric bell is soft iron which can induce magnetism rapidly.
APPEARS IN
संबंधित प्रश्न
Name one device that uses an electromagnet.
Electromagnets are made up of :
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.
Name one device that uses an electromagnet.
Why is soft iron used as the core of the electromagnet in an electric bell?
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.
