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प्रश्न
State the condition when an electric charge can give rise to a magnetic field.
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उत्तर
When an electric charge flows in a conductor, a magnetic field is produced around it.
संबंधित प्रश्न
Tick the most appropriate answer.
Which of the following methods is used to magnetize a magnetic without touching it by a magnet?
State two differences between an electromagnet and a permanent magnet.
What is an electric motor?
principle of an electric motor ?
State two factors on which the magnitude of an induced e.m.f. in the secondary coils of a transformer depends.
Answer the following in short.
Name a few common appliances that use electromagnets.
State three factors which govern the speed of rotation of an electric motor.
What energy conversion takes place during the working of a d c motor?
State the position of armature coil relative to the direction of magnetic field, in a D. C. motor when the deflecting couple acting an the coil is maximum.
(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.
