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Question 31480
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Electrostatics: Electrostatics Advanced MCQ

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Electrostatics AdvancedHardQuestion 31480

Question

Method of images: a point charge q at distance d from an infinite grounded conductor can be replaced by:
  1. A
    +q at mirror image position
  2. B
    −q at mirror image position
    Correct
  3. C
    q/2 at the surface
  4. D
    No replacement possible

Correct answer

−q at mirror image position

Explanation

Method of images: grounded conductor (V=0) replaced by image charge −q at the mirror position (d behind the surface). The induced surface charge creates the same field as this image charge.

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