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Question 31464
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Electrostatics: Gauss's Law MCQ

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Gauss's LawMediumQuestion 31464

Question

Charge +Q is placed at centre of a spherical shell of radius R. Charge on inner surface of shell is:
  1. A
    +Q
  2. B
    −Q
    Correct
  3. C
    Zero
  4. D
    +2Q

Correct answer

−Q

Explanation

Gauss's law with surface inside shell conductor: E = 0 inside conductor → charge on inner surface = −Q to cancel the field.

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