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प्रश्न
State the purpose of the iron core.
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उत्तर
The purpose of the iron core is to intensify the strength of the magnetic field inside the solenoid and thereby increase the strength of the electromagnet.
संबंधित प्रश्न
State two ways of magnetising an iron piece?
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?
State two factors on which the magnitude of an induced e.m.f. in the secondary coils of a transformer depends.
State two factors on which the strength of induced e. m.f. depends.
What is a permanent magnet? Give one use of it.
State two advantages of an electromagnet over a bar magnet.
State three factors which govern the speed of rotation of an electric motor.
What energy conversion takes place during the working of a d c motor?
What is dynomo (a.c. generator)? State the principle on which it works.
