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Electromagnetic TheoryBoundary Conditions

At the surface of a perfect conductor in electrostatic equilibrium, the tangential electric field is?

  • AZero
  • BMaximum
  • CEqual to normal electric field
  • DEqual to current density
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Correct Answer: A. Zero
Explanation: A nonzero tangential electric field would drive free charges, so electrostatic equilibrium requires Et=0.
Reference: Standard electromagnetic theory: boundary conditions
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