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प्रश्न
Name the material used for making the armature of an electric bell. Give a reason for your answer.
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उत्तर
The material used for making the armature of an electric bell is soft iron which can induce magnetism rapidly.
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संबंधित प्रश्न
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.
Name two factors on which the strength of magnetic field of an electromagnet depends and state how does it depend on the factors stated by you.
State three uses of an electromagnet?
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 ______.
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.
What energy conversion takes place during the working of a d c motor?
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
What are the factors that govern the magnitude of force acting on a current carrying conductor which is freely suspended in a magnetic field?
Point out three differences between an electromagnet and a bar (or permanent) magnet.
