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NEET2007PhysicsElectrostaticsActual

Assertion : In a cavity within a conductor, the electric field is zero. Reason : Charges in a conductor reside only at its surface.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

A. If both assertion and reason are true and reason is the correct explanation of assertion

Step-by-step solution

Both the assertion and reason are true and the reason is the correct explanation. It is because the charges are only at the surface of a conductor; the charge enclosed in the Gaussian surface in the cavity is zero. The field is therefore zero.

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