What are magnetic field lines? Justify the following statements (a) Two magnetic field lines never intersect each other. (b) Magnetic field lines are closed curves.
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The magnetic field lines are the lines drawn in a magnetic field along which a North magnetic pole would move. The magnetic field lines are also known as magnetic lines of force.
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The path traced by a North magnetic pole free to move under the influence of a magnetic field is called a magnetic field line.
(a) The magnetic field lines do not intersect or cross one another. This is due to the fact that the resultant force on a North Pole at any point can be only in one direction. But if the two magnetic field lines intersect one another, then the resultant force on a North Pole placed at the point of intersection will be along to directions, which is not possible.
(b) Magnetic field lines are closed curves or forms a closed loop. This is because two magnetic field lines can never intersect. And forming closed curves enable the lines to run different from each lines and not intersect to each other.
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Magnetic field lines:
- Magnetic field lines are the lines in a magnetic field the tangent of which at any point will give the field direction at that point and its density gives the magnitude of the field.
- They denote the direction of the magnetic field. The magnetic field intensity depends on the number of magnetic field lines.
Statement (a): If magnetic field lines intersect each other, then at the intersection point there will be two directions of the same field which is not possible. Hence the field lines do not cross or intersect each other.
Statement (b): Magnetic field lines are closed curves as they propagate from the North pole outside the magnet's body to the magnet's body and from the south pole to the north pole inside the magnet's body. Hence, the magnetic field lines are closed.
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