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The standing wave produced by total reflection from a perfect conductor has an electric field

  • A.uniform amplitude throughout the region
  • B.node at the conductor surface
  • C.maximum at the conductor surface
  • D.node a quarter wavelength beyond the conductor

Answer: B

The boundary condition forces the tangential electric field to zero there, so the surface is a node for E and, a quarter wavelength away, an antinode. The magnetic field behaves in the opposite sense, having an antinode at the surface.

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