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
The diagram shows a coil wound around a U shape soft iron bar AB.
1) What is the polarity induced at the ends A and B when the switch is pressed?
2) Suggest one way to strengthen the magnetic field in the electromagnet
3) What will be the polarities at A & B if the direction of current is reversed in the circuit?
State two ways of magnetising an iron piece?
You are given an iron nail, a torch cell, and a long piece of insulated copper wire. With the help of a labelled neat diagram, describe in steps how you will make the nail, an electromagnet.
Name and state the rule by which polarity at the ends of a current carrying solenoid is determined.
State two factors on which the strength of induced e. m.f. depends.
State the two properties of the magnetic lines of force around a circular coil.
How does a magnetic field set up by a solenoid change when number of turns are increased?
What is a permanent magnet? Give one use of it.
What are the factors that govern the magnitude of force acting on a current carrying conductor which is freely suspended in a magnetic field?
How does a magnetic field set up by a solenoid change when cross-sectional area of solenoid is increased?
