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प्रश्न
Name the material used for making the armature of an electric bell. Give a reason for your answer.
What material is used for making the armature of an electric bell? Give a reason for using this material.
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उत्तर
The material used for making the armature of an electric bell is soft iron, which can induce magnetism rapidly.
संबंधित प्रश्न
State two differences between an electromagnet and a permanent magnet.
Fill in the blanks by writing (i) Only soft iron, (ii) Only steel, (iii) Both soft-iron and steel for the material of core and/or magnet.
Electric bell ______.
A straight wire is held vertical and current is passed in it in the upward direction. A compass needle is kept near the wire in north of it. How is the needle deflected? What is the change in the deflection of the needle if the current in wire is reversed?
How does a magnetic field set up by a solenoid change when a soft iron core is inserted inside solenoid?
State the condition when an electric charge can give rise to a magnetic field.
What is a permanent magnet? Give one use of it.
What energy conversion takes place during the working of a d c motor?
State the principle of a D. C. motor.
What is dynomo (a.c. generator)? State the principle on which it works.
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
