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Manipal MET2012PhysicsMagnetic Effects of Current

The ratio of magnetic moments of two short magnets which give null deflection in B position at 12 cm and 18 cm from the centre of a deflection magnetometer is

Options

  1. A2: 3
  2. B8: 27
  3. C27: 8
  4. D4: 9

Correct answer

B. 8: 27

Step-by-step solution

According to question, aligned & M₁ d₁^3 = M₂ d₂^3 & M₁ M₂ = ( d₁ d₂ )^3= ( 12 18 )^3 & M₁ M₂ = 8 27 aligned

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