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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
How will you make an iron bar electromagnet? Draw a diagram showing the polarities 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.
Describe a simple Experiment to demonstrate that there Exists a magnetic field around a current-carrying conductor.
State the condition when an electric charge can give rise to a magnetic field.
What is a permanent magnet? Give one use of it.
What energy conversion takes place during the working of a d c motor?
State the energy change that takes’place in a D. C. motor.
The primary windings of a step-up transformer are usually made of thicker wire than the secondary. Explain.
(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.
Which magnet will you use?
Iron is to be separated from trash.
