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Magnetic field intensity \( \mathbf{H} \) has units of

  • A.teslas
  • B.webers per square metre
  • C.amperes per square metre
  • D.amperes per metre

Answer: D

Since Ampere's law equates the line integral of H to a current, H must be a current divided by a length. Multiplying by the permeability gives the flux density in teslas, which is a very much larger number in free space.

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