Neutral points are obtained when field lines are plotted for a magnet
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Neutral point
A point at which the magnetic field induction B due to a bar magnet is nullified by the horizontal component of the earth’s magnetic field induction (B0) is called a neutral point.
The earth is a huge magnet. At every point on the earth, its magnetic field has a certain value for its horizontal component, represented by B0. It remains constant, both in magnitude as well as in direction, at a given place. The direction of the horizontal component of the earth’s magnetic field is along the magnetic meridian from the geographical south to the geographical north.
The magnetic field lines around a bar magnet can be mapped with the help of a magnetic compass. The magnetic field lines due to a bar magnet are closed loops. They leave at the north pole and enter at the south pole. When you plot the magnetic field lines around a bar magnet, the horizontal component of the earth’s magnetic field, B0, influences the magnetic field induction, B, due to the bar magnet. At points close to the bar magnet, magnetic induction B due to the bar magnet is very high as compared to the horizontal component of the earth’s magnetic field, B0. Thus, B0 is negligible.
According to the inverse square law of magnetism, magnetic field induction B due to the bar magnet decreases as we move away from it. At certain points around the bar magnet, B and B0 are equal in magnitude and opposite in direction. Therefore, they cancel each other out, and the resultant magnetic field is zero.
Thus, the point where magnetic field induction B due to a bar magnet is equal in magnitude and opposite in direction to the horizontal component of the earth’s magnetic field induction, B0, is called a neutral point.
The neutral points around a bar magnet can be located in two different cases.
i. When the north pole of the bar magnet points towards the earth’s north pole
ii. when the south pole of the bar magnet points towards the earth’s north pole.
A point at which the magnetic field induction B due to a bar magnet is nullified by the horizontal component of the earth’s magnetic field induction (B0) is called a neutral point.
The earth is a huge magnet. At every point on the earth, its magnetic field has a certain value for its horizontal component, represented by B0. It remains constant, both in magnitude as well as in direction, at a given place. The direction of the horizontal component of the earth’s magnetic field is along the magnetic meridian from the geographical south to the geographical north.
The magnetic field lines around a bar magnet can be mapped with the help of a magnetic compass. The magnetic field lines due to a bar magnet are closed loops. They leave at the north pole and enter at the south pole. When you plot the magnetic field lines around a bar magnet, the horizontal component of the earth’s magnetic field, B0, influences the magnetic field induction, B, due to the bar magnet. At points close to the bar magnet, magnetic induction B due to the bar magnet is very high as compared to the horizontal component of the earth’s magnetic field, B0. Thus, B0 is negligible.
According to the inverse square law of magnetism, magnetic field induction B due to the bar magnet decreases as we move away from it. At certain points around the bar magnet, B and B0 are equal in magnitude and opposite in direction. Therefore, they cancel each other out, and the resultant magnetic field is zero.
Thus, the point where magnetic field induction B due to a bar magnet is equal in magnitude and opposite in direction to the horizontal component of the earth’s magnetic field induction, B0, is called a neutral point.
The neutral points around a bar magnet can be located in two different cases.
i. When the north pole of the bar magnet points towards the earth’s north pole
ii. when the south pole of the bar magnet points towards the earth’s north pole.
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Answer:
We all know about neutral points, which are nothing but points where the Earth's magnetic field neutralizes a magnet's magnetic field. When the north of a magnet faces geographic north, then the neutral points are perpendicular to the magnet's length
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