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प्रश्न
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.
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उत्तर
Soft iron is used in all.
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संबंधित प्रश्न
Name and state the rule by which polarity at the ends of a current carrying solenoid is determined.
principle of an electric motor ?
Answer the following in short.
Name a few common appliances that use electromagnets.
State two factors on which the strength of induced e. m.f. depends.
How does a magnetic field set up by a solenoid change when strength of current in the solenoid is decreased?
Why is soft iron generally used as the core of the electromagnet?
State two advantages of an electromagnet over a bar magnet.
What energy conversion takes place during the working of a d c motor?
State the position of armature coil relative to the direction of magnetic field, in a D. C. motor when the deflecting couple acting and the coil is minimum.
How does a magnetic field set up by a solenoid change when cross-sectional area of solenoid is increased?
