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प्रश्न
Under what conditions permanent electromagnet is obtained if a current carrying solenoid is used? Support your answer with the help of a labelled circuit diagram.
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उत्तर
The following conditions are required to obtain permanent electromagnet when a current-carrying solenoid is used :
- Rod inside the solenoid should be made of a magnetic material like steel which should retain magnetic properties for a long time after magnetization.
- The current through the solenoid should be direct current.
- The number of turns in the solenoid should be large and closely packed so that a strong uniform magnetic field inside it is produced.
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संबंधित प्रश्न
How does a solenoid behave like a magnet? Can you determine the north and south poles of a current-carrying solenoid with the help of a bar magnet? Explain.
The figure shows a solenoid wound on a core of soft iron. Will the end A be a N pole or S pole when the current flows in the direction shown?
The following diagram shows a spiral coil wound on a hollow carboard tube AB. A magnetic compass is placed close to it. Current is switched on by closing the key.
- What will be the polarity at the ends A and B?
- How will the compass needle be affected? Give reason.
State two ways by which the magnetic field due to a current carrying solenoid can be made stronger.
What effect will there be on a magnetic compass when it is brought near a current carrying solenoid?
How is the magnetic field due to a solenoid carrying current affected if a soft iron bar is introduced inside the solenoid?
A current carrying solenoid behaves like a ______.
A current carrying solenoid when freely suspended, it always rests in ______ direction.
Draw the pattern of magnetic field lines of a solenoid through which a steady current flows. What does the pattern of field lines inside the solenoid indicate?
What is a solenoid? Why do we usually keep its diameter small in comparison to its length?
Which of the following diagrams correctly shows the magnetic field produced by a current-carrying wire?
The diagram below shows a magnet moved near a coil along its axis. Which of the diagram shows correct flow of current during this motion?
What does the divergence of magnetic field lines near the ends of a current carrying straight solenoid indicate?
A circuit contains a battery, a variable resistor and a solenoid. The figure below shows the magnetic field pattern produced by the current in the solenoid.
- State how the magnetic field pattern indicates regions where the magnetic field is stronger.
- What happens to the magnetic field when the current in the circuit is reversed?
Observe the given figure of a current-carrying solenoid and write the labels of A and B correctly.
Refer to the image below and state how the magnetic field pattern indicates regions where the magnetic field is stronger outside the magnet. What happens to the magnetic field when the current in the circuit is reversed?
How is a solenoid prepared?
Draw a neat diagram of a solenoid and name its various components.
