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An earthed conducting plane lies below a point charge. The field lines from the charge meet the plane

  • A.tangentially
  • B.at forty-five degrees
  • C.not at all
  • D.at right angles

Answer: D

The plane is an equipotential, and the field is always normal to an equipotential surface. That boundary condition is what the method of images is constructed to satisfy, by placing an equal and opposite charge below the plane.

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