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True or false: the normal component of the electric field intensity is continuous across a dielectric boundary.

  • A.True, the potential being continuous across the boundary
  • B.True, provided no free charge lies on the boundary
  • C.True, both fields being continuous in the absence of free charge
  • D.False, the normal component of the flux density being the continuous one

Answer: D

It is the normal flux density that is continuous when no free surface charge is present; the field intensity jumps in inverse proportion to the permittivities. The tangential intensity is the component that is always continuous.

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