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What is the number netural points for a ...

What is the number netural points for a bar magnet with its north pole pointing geographical north ?

A

Zero

B

One

C

Two

D

Infinite

Text Solution

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The correct Answer is:
To determine the number of neutral points for a bar magnet with its north pole pointing towards geographical north, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Magnetic Poles**: - A bar magnet has two poles: a north pole (N) and a south pole (S). When the north pole of the bar magnet is aligned with the geographical north, the south pole will point towards the geographical south. 2. **Magnetic Field of the Earth**: - The Earth itself has a magnetic field, which can be visualized as having a magnetic north pole (near the geographical north) and a magnetic south pole (near the geographical south). The magnetic field lines of the Earth emerge from the magnetic south pole and enter the magnetic north pole. 3. **Magnetic Field of the Bar Magnet**: - The magnetic field lines of the bar magnet also emerge from its north pole and enter its south pole. This means that the field lines of the bar magnet will also run from the north pole to the south pole. 4. **Superposition of Magnetic Fields**: - When the bar magnet is placed in the Earth's magnetic field, the two magnetic fields will interact. The resultant magnetic field at any point in space will be the vector sum of the magnetic field of the Earth and the magnetic field of the bar magnet. 5. **Identifying Neutral Points**: - Neutral points are locations where the magnetic field strength is zero. This occurs when the magnetic field of the bar magnet cancels out the magnetic field of the Earth. - In this scenario, there will be two neutral points: one on the line extending from the north pole of the bar magnet and one on the line extending from the south pole of the bar magnet. 6. **Conclusion**: - Therefore, when the north pole of the bar magnet points towards the geographical north, there will be **two neutral points**. ### Final Answer: The number of neutral points for a bar magnet with its north pole pointing towards geographical north is **2**.
To determine the number of neutral points for a bar magnet with its north pole pointing towards geographical north, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Magnetic Poles**: - A bar magnet has two poles: a north pole (N) and a south pole (S). When the north pole of the bar magnet is aligned with the geographical north, the south pole will point towards the geographical south. 2. **Magnetic Field of the Earth**: ...
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