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प्रश्न
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 ______.
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उत्तर
Electric bell magnet - soft iron
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संबंधित प्रश्न
Suppose you are given a long bar magnet and you are asked to break it into four small magnets. Draw diagrams showing the polarities of each broken part.
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.
principle of an electric motor ?
Name the material of core in (a) an electric bell, (b) electromagnet, (c) a d.c. motor, (d) an a.c. generator and (e) a transformer.
Name the type of transformer shown in fig . What changes will you observe regarding the brightness of the lamp, if
(a) The no. of turns in the secondary is doubled?
(b) The part X of the transformer is removed?
( c) The core of the transformer is made out of copper?
(d ) The A.C. supply is replaced by D.C.?
Complete the following sentence :
On reserving the direction of current in a wire, the magnetic field produced by it gets _____.
Describe a simple Experiment to demonstrate that there Exists a magnetic field around a current-carrying conductor.
State the purpose of the iron core.
How does a magnetic field set up by a solenoid change when number of turns are increased?
State three factors which govern the speed of rotation of an electric motor.
