Magnetic Field


 
 
Concept Explanation
 

Magnetic Field

The force exerted by a magnet on the various magnetic substance is called magnetic force. The magnetic force is a non contact force that is it is effective from a distance. Obviously, there must be some influence of the magnet on the space around it. This influence reduces as we go further away from the magnet. The area where the magnetic force is applicable is called magnetic field.

  • This can be verified by placing a compass needle near a magnet. The needle gets deflected due to the effect of the magnet.
  • If you move the compass needle above, below and to the side of the magnet, the needle gets deflected all around the magnet. Take the needle further and further away, the influence of the magnet becomes weaker and weaker, until at some distance away it is not felt at all.
  • Thus, here is a region around the magnet where its magnetic influence can be felt. This region is called the magnetic field of the magnet.

                                   

                                         Bar magnet showing magnetic field lines

    Sample Questions
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    Question : 1

    The area where the magnetic force is applicable is called_____________

    Right Option : B
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    Explanation
    Question : 2

    The influence of magnetic field _______________________ as we go further away from the magnet.

    Right Option : B
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    Explanation
    Question : 3

    Which of the following are correct :

    (a) The magnetic force is a non contact force that is it is effective from a distance.

    (b) The area where the magnetic force is applicable is called magnetic field.

    (c) The force exerted by a magnet on the various magnetic substance is called magnetic force.

    Right Option : D
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    Explanation
     
     


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