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What is a solenoid? - Science

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Question

What is a solenoid?

Short Answer
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Solution

A solenoid is a copper wire with a resistive coating coiled into a chain of loops. When an electric current flows through a solenoid, magnetic lines of force form in a pattern. Solenoid magnetic fields are similar to those created by bar magnets. A solenoid's open ends function as magnetic north and south poles, respectively.

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Chapter 4: Effects of electric current - Answer in one sentence.

RELATED QUESTIONS

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.


Why does a current carrying, freely suspended solenoid rest along a particular direction?


State the direction in which current-carrying freely suspended solenoid rests


The adjacent diagram shows a small magnet placed near a solenoid AB. Current is switched on in the solenoid by pressing the key K.

  1. State the polarity at the ends A and B.
  2. Will the magnet be attracted or repelled? Give a reason for your answer.


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.

  1. What will be the polarity at the ends A and B?
  2. 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.


Why does a current carrying freely suspended solenoid rest along a particular direction? State the direction in which it rests.


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 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?


Draw magnetic field lines in and around a current-carrying straight solenoid.


The diagram shows a current-carrying coil passing through a cardboard sheet. Draw three magnetic lines of force on the board.

State two factors on which magnitude of magnetic field at the centre depends.


Sketch the lines of force of the magnetic field of a solenoid. How does its field compare with that of a bar magnet?


The adjacent diagram shows a small magnet placed near a solenoid. State whether the magnet is attracted or repelled, as the switch is pressed. Give a reason.


The magnetic field lines outside a bar magnet:


Which of the following diagrams correctly shows the magnetic field produced by a current-carrying wire?


The pattern of the magnetic field produced by the straight current-carrying conducting wire is ____________.


The factors on which one magnetic field strength is produced by current-carrying solenoids depends are


For a current in a long straight solenoid, N-pole and S-pole are created at the two ends. Among the following statements, the incorrect statement is ____________.


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?


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.


What does the divergence of magnetic field lines near the ends of a current carrying straight solenoid indicate?


The diagram below shows an insulated copper wire wound around a hollow cardboard cylindrical tube. Answer the questions that follow:

  1. What are the magnetic poles at A and B when the key K is closed?
  2. State two ways to increase the strength of the magnetic field in this coil without changing the coil.
  3. If we place a soft iron bar at the centre of the hollow cardboard and replace the DC source with an AC source then will it attract small iron pins toward itself when the current is flowing through the coil?

Ansari Sir was demonstrating an experiment in his class with the setup as shown in the figure below.

A magnet is attached to a spring. The magnet can go in and out of the stationary coil. He lifted the Magnet and released it to make it oscillate through the coil.
Based on your understanding of the phenomenon, answer the following question.

Is there any difference in the observations in the galvanometer when the Magnet swings in and then out of the stationary coil? Justify your answer.


Observe the given figure of a current-carrying solenoid and write the labels of A and B correctly.


For the current carrying solenoid as shown, draw magnetic field lines and give reason to explain that out of the three points A, B and C, at which point the field strength is maximum and at which point it is minimum? 


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?


Current is flowing through a coil as shown in the figure. Which one of the given figures will correctly depict the magnetic polarity and the direction of the lines of force along the axis of the coil?


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