Assertion (A): The magnetic field lines around a bar magnet are closed...
- Assertion (A) is true; magnetic field lines around a bar magnet are indeed closed curves.
- Reason (R) is also true; inside the magnet, the direction of field lines runs from its south pole to its north pole.
- However, the Reason does not correctly explain Assertion, as the closure of field lines is a consequence of the overall magnetic field configuration rather than just the direction of the field lines inside the magnet.
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Assertion (A): The magnetic field lines around a bar magnet are closed...
Assertion (A) Explained
The assertion states that "The magnetic field lines around a bar magnet are closed curves."
- **Closed Curves:** Magnetic field lines indeed form closed loops. They exit from the north pole of the magnet, travel through the external space, and return to the south pole, thereby completing a loop.
- **Visual Representation:** If you visualize the magnetic field lines, they curve around the magnet and connect back internally, illustrating their closed nature.
Reason (R) Explained
The reason states that "Inside the magnet, the direction of field lines is from its south pole to its north pole."
- **Direction Inside the Magnet:** This statement is accurate; magnetic field lines do indeed flow from the south pole to the north pole when considering the interior of the magnet.
- **Mismatch in Explanation:** However, while this reason is true, it doesn't logically explain why the assertion about closed curves is correct. The assertion focuses on the external behavior of the field lines, while the reason pertains to the internal direction only.
Conclusion
- Since both the Assertion and Reason are true, but the Reason does not provide a correct explanation for the Assertion, the correct option is **b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.**
This distinction is crucial in understanding the nature of magnetic fields and their behavior around magnetic materials.