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प्रश्न
Answer the following in short.
Name a few common appliances that use electromagnets.
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उत्तर
Electric bells, electric motor, telephones, loudspeakers, and generators are few common appliances that use electromagnets.
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संबंधित प्रश्न
You are given an iron nail, a torch cell, and a long piece of insulated copper wire. With the help of a labelled neat diagram, describe in steps how you will make the nail, an electromagnet.
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 ______.
The magnetic flux through a coil having 100 turns decreases from 5 milli weber to zero in 5 second. Calculate the e.m.f. induced in the coil.
State two factors on which the strength of induced e. m.f. depends.
Why is soft iron generally used as the core of the electromagnet?
What is a permanent magnet? Give one use of it.
What energy conversion takes place during the working of a d c motor?
(i) A straight wire conductor passes vertically through a piece of cardboard sprinkled with iron filings. Copy the diagram and show the setting of iron filings when a current is passed through the wire in the upward direction and the cardboard is tapped gently. Draw arrows to represent the direction of the magnetic field lines.
(ii) Name the law which helped you to find the direction of the magnetic field lines.
State the function of a split ring in D.C. motor.
Which magnet will you use?
Iron is to be separated from trash.
