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प्रश्न
Explain with the help of a diagram how the intensity and direction of the magnetic field of a bar magnet can be determined.
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उत्तर
Take drawing cardboard and sprinkle some iron filings on it. Notice the position of the iron filings as a whole. Now, take a bar magnet and slowly bring it below the cardboard. You will observe that the iron filings tend to attract towards the magnet as shown below.
To find the direction of the magnetic field around a bar magnet, place a magnetic compass with its South-Pole near one of the poles of the bar magnet. Locate the point where the North-pole of the needle points. Now, lift the needle and place its South-Pole on the marked point. Now, again see where the North Pole points. Repeat this process and you will get the direction of the magnetic field as shown below.
To find the intensity of the magnetic field around a region of a bar magnet, we need to calculate the number of lines crossing through the unit area of that region. For example, if we have to calculate the intensity of the magnetic field at points A and B, then draw unit areas around A and B first and then calculate the number of lines passing through that area. By doing so, we see that the intensity of the field at A is greater than that at B.
संबंधित प्रश्न
A plotting compass is placed near the south pole of a bar magnet. The pointer of plotting compass will:
The metallic pointer of a plotting compass gets deflected only when it is placed near a bar magnet because the pointer has:
The three diagrams in the following figure show the lines of force (field lines) between the poles of two magnets. Identify the poles A, B, C, D, E and F.
The change in magnetic field lines in a coil is the cause of induced electric current in it. Name the underlying phenomenon.
The unit of magnetic flux density is ______.
State whether true or false. If false, correct the statement.
Fleming’s Left hand rule is also known as Dynamo rule.
Choose the incorrect statement from the following regarding magnetic lines of field
The magnetic field at a point is ______ to the magnetic field lines.
A wire placed along north south direction carries a current of 5A from south to north. Find the magnetic field due to a 1m piece of wire at a point 200 cm north east from the piece.
Draw magnetic field lines produced around a straight current carrying conductor passing through a cardboard. How will the strength of the magnetic field change when the point where magnetic field is to be determined is moved away from the conductor?
