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NEET2026PhysicsChapterActual

When a sample of an unknown material is placed in a non-uniform magnetic field, it is observed to experience a net force driving it from the stronger to the weaker part of the field. Which of the following pairs of values could correctly represent the magnetic susceptibility ( ) and relative permeability ( _r ) of this material?

Options

  1. A= 0.004 , _r = 1.004
  2. B= 500 , _r = 501
  3. C= -0.004 , _r = 0.996
  4. D= -0.004 , _r = 1.004

Correct answer

C. = -0.004 , _r = 0.996

Step-by-step solution

When a material is placed in a non-uniform magnetic field and experiences a net force driving it from the stronger to the weaker part of the field, it exhibits diamagnetism. For diamagnetic materials, the magnetic susceptibility is small and negative, i.e., -1 The relative permeability _r is related to magnetic susceptibility by the relation _r = 1 + . Since is small and negative, _r must be slightly less than 1 . Checking the given options, only = -0.004 and _r = 0.996 satisfy both conditions ( Answer: = -0.004 ,

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