Advertisements
Advertisements
प्रश्न
Which magnet will you use?
Iron is to be separated from trash.
Advertisements
उत्तर
An electromagnet can be used to separate iron from trash because it can be turned on and off, allowing selective attraction of iron objects. Electromagnets are effective for this purpose, as they create a magnetic field when energised, attracting ferromagnetic materials like iron.
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.
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.
State two factors on which the magnitude of an induced e.m.f. in the secondary coils of a transformer depends.
Describe briefly one way of producing an induced current in a coil. State one factor that determines the magnitude of induced e.m.f.
Why is soft iron generally used as the core of the electromagnet?
State two advantages of an electromagnet over a bar magnet.
State the principle of a D. C. motor.
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
Write the answer in your words.
How is an electromagnet made?
