Verified Solution • 2025–26 Session moderate

QPage 277: Q5: HC Verma: Concepts of Physics - Volume 2 Permanent Magnets Page 277: Q5 Solution: To measure the magnetic moment of a bar magnet, one may use

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume a single instrument can measure magnetic moment in isolation, failing to recognize that both deflection and oscillation methods require the Earth's horizontal field ($B_H$) as a known reference. If $B_H$ is unknown, one must combine equations from both instruments to eliminate it and solve for $M$.

To measure the magnetic moment of a bar magnet, one may use

Multiple Choice Options

  • A a tangent galvanometer
  • B a deflection galvanometer if the earth's horizontal field is known
  • C an oscillation magnetometer if the earth's horizontal field is known
  • D both deflection and oscillation magnetometer if the earth's horizontal field is not known

Step-by-Step Verified Solution

**Answer:** (b), (c), (d). **Step-by-Step Explanation:** A deflection magnetometer can measure M if B_H is known. An oscillation magnetometer can measure M if B_H is known. If B_H is not known, both can be used together to find M.

All Questions in this Chapter

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