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प्रश्न
Describe briefly one way of producing an induced current in a coil. State one factor that determines the magnitude of induced e.m.f.
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उत्तर
To produce an induced current in a coil, a magnet is moved along the axis of coil. The magnitude of induced e.mi. depends on the strength of magnet.
संबंधित प्रश्न
State two ways of magnetising an iron piece?
How will you make an iron bar electromagnet? Draw a diagram showing the polarities of the electromagnet?
Suppose you are given a long bar magnet and you are asked to break it into four small magnets. Draw diagrams showing the polarities of each broken part.
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.
State the condition when an electric charge can give rise to a magnetic field.
State two advantages of an electromagnet over a bar magnet.
State the energy change that takes’place in a D. C. motor.
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
(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.
