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Concepts Of Physics MCQ Edition [Volume 2]PhysicsPermanent Magnets

For measuring the magnetic moment of a bar magnet, one could use

Options

  1. Aa tangent galvanometer
  2. Ban oscillation magnetometer, provided the earth's horizontal field is known
  3. Ca deflection galvanometer, provided the earth's horizontal field is known
  4. Dboth deflection and oscillation magnetometer, if the earth's horizontal field is not known

Correct answer

D. both deflection and oscillation magnetometer, if the earth's horizontal field is not known

Step-by-step solution

The time period of oscillation of a bar magnet in an oscillation magnetometer is given by T = 2 I MB_H . This gives the product MB_H = 4 ^2 I T^2 . If the earth's horizontal magnetic field B_H and the moment of inertia I are known, the magnetic moment M can be determined. In a deflection magnetometer, the deflection is related to M and B_H by M B_H = k , where k is a constant depending on the position (Tan A or Tan B). If B_H is known, M can be determined. If B_H is not known, we can use both instruments. The oscil

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