Home Physics Magnetism and Matter Magnetic Equipments To compare magnetic moments of two magnets b…
Physics Magnetism and Matter Magnetic Equipments Single Correct MCQ
Published on: September 12, 2026

To compare magnetic moments of two magnets by vibration magnetometer, 'sum and difference method' is better because

A
Determination of moment of inertia is not needed which minimises the errors
B
Less observations are required
C
Comparatively less calculations
D
All the above

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The correct answer is:
D
The 'sum and difference method' in a vibration magnetometer is preferred for comparing magnetic moments due to several advantages:
  • Step 1: In this method, we do not need to determine the moment of inertia of the magnetic system, which is involved in a direct measurement approach. This reduces experimental errors as the moment of inertia can be difficult to measure accurately.
  • Step 2: Fewer observations are required since the method directly uses the resonance frequencies of the magnets rather than needing to measure multiple parameters all the time.
  • Step 3: The calculations involved are simpler as the method yields results directly related to the differences in the frequencies without extensive calculations for each magnetic moment.
Therefore, the 'sum and difference method' minimizes errors, requires less observational data, and simplifies calculations, making the correct answer option D: All the above.

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