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Question
"Magnetic field is a physical quantity that has both direction and magnitude." How can this statement be proved with the help of magnetic field lines of a bar magnet?
Solution
A magnetic field has both a direction and a magnitude. The north pole of the compass needle's movement inside the magnetic field is taken to indicate the magnetic field's direction. The field lines are assumed to arise from the North Pole and combine at the South Pole as a result of convention. Field lines inside the magnet go from its south pole to its north pole. These closed curves are the magnetic field lines.
The degree of closeness of the field lines reveals the relative intensity of the magnetic field. Where there are more field lines, there is a stronger field, meaning that there is more force acting on the pole of another magnet.
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