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प्रश्न
Which magnet will you use?
Iron is to be separated from trash.
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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 energized, 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.
What is an 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?
State two factors on which the magnitude of an induced e.m.f. in the secondary coils of a transformer depends.
How does a magnetic field set up by a solenoid change when number of turns are increased?
How does a magnetic field set up by a solenoid change when strength of current in the solenoid is decreased?
State three factors which govern the speed of rotation of an electric motor.
What is dynomo (a.c. generator)? State the principle on which it works.
State the factors, on which depends the magnitude of the force acting on current carrying conductor, when it is kept in a magnetic field perpendicular to it.
