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QPage 285: Q4: HC Verma: Concepts of Physics - Volume 2 Magnetic Properties of Matter Page 285: Q4 Solution: A rod, when suspended in a magnetic field, stays in the…

A rod, when suspended in a magnetic field, stays in the east-west direction. Can we be sure that the field is in the east-west direction? Can it be in the north-south direction?

Step-by-Step Verified Solution

**Answer:** No, we cannot be sure that the field is in the east-west direction. Yes, it can be in the north-south direction. **Step-by-Step Explanation:** A rod suspended in a magnetic field aligns itself along the direction of the magnetic field only if it is a magnetic material. For a non-magnetic rod, it will align along the earth's magnetic field (north-south). If the rod stays in the east-west direction, it could be because the external field is east-west, or it could be because the rod is diamagnetic and its induced moment opposes the earth's field, causing it to align perpendicular to the north-south direction. Hence, we cannot be certain about the field direction without more information.

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