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प्रश्न
(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.
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उत्तर
(i)
(ii) Right hand thumb rule helped to find the direction of magnetic field lines.
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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.
State three uses of an electromagnet?
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.
Name the type of transformer shown in Fig. What changes will you observe regarding the brightness of the lamp, if
- the number of turns in the secondary is doubled? Explain.
- the part X of the transformer is removed?
- the core of the transformer is made out of copper?
- the A.C. supply is replaced by D.C.?
Answer the following in short.
Name a few common appliances that use electromagnets.
State two factors on which the strength of induced e. m.f. depends.
Describe a simple Experiment to demonstrate that there Exists a magnetic field around a current-carrying conductor.
State two advantages of an electromagnet over a bar magnet.
What will be the effect on the working of an electric bell if instead of a direct current an alternating current is used?
Point out three differences between an electromagnet and a bar (or permanent) magnet.
