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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
Where do the manufactures use a magnetic strip in the refrigerator? Why is this magnetic strip used?
A plotting compass is placed near the south pole of a bar magnet. The pointer of plotting compass will:
The diagram shows a bar magnet surrounded by four plotting compasses. Copy the diagram and mark in it the direction of he compass needle for each of the cases B, C, and D.
Which is the north pole, X or Y?
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.
Define the term magnetic field of a magnet. How will you recognize it experimentally?
A current flowing in a wire gives rise to a magnetic field.
The magnetic field lines due to a straight wire carrying current are parallel.
Magnetic fields do not interact with electric charges in motion.
The field at the center of the long circular coil carrying current will be parallel straight lines.
Assertion (A): The work done by a magnetic field on a moving charge is zero.
Reason (R): In a magnetic field force is perpendicular to the velocity.
