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QPages 275-276: Q3: HC Verma: Concepts of Physics - Volume 2 Permanent Magnets Pages 275-276: Q3 Solution: An iron needle is attracted to the ends of a bar magnet but not …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often incorrectly assume that the lack of attraction at the magnet's center implies a change in material composition or a non-magnetic core. You must distinguish between the uniform ferromagnetic material of the bar and the non-uniform magnetic field strength, which is maximum at the poles and minimum at the neutral axis.

An iron needle is attracted to the ends of a bar magnet but not to the middle region of the magnet. Is the material making up the ends of a bare magnet different from that of the middle region?

Step-by-Step Verified Solution

**Answer:** No, the material at the ends is not different from the middle. **Step-by-Step Explanation:** An iron needle is attracted to the ends of a bar magnet but not to the middle because the magnetic field is strongest at the poles. The field lines emerge from the north pole and enter the south pole, and the field is strongest near these poles. In the middle region, the field lines are weaker because they are further apart. The iron itself is the same throughout the magnet [citation:3].

All Questions in this Chapter

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