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At a conductor to dielectric boundary, the tangential field in the dielectric is

  • A.equal to the normal field at the same point
  • B.discontinuous, taking different values on the two sides
  • C.zero
  • D.equal to the surface charge density over the permittivity

Answer: C

The conductor surface is an equipotential, so no tangential field can exist just outside it either, the tangential component being continuous. The normal component is fixed by the surface charge density divided by the permittivity of the dielectric.

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