Answer and explanation

Correct answer: B. Zero

  1. Step 1: All the charge on a conductor lies on its outer surface, and by Gauss's law a closed surface inside encloses no charge, so the field inside is zero. Answer: Zero. Why not the others: The field is greatest just outside the surface, not inside, it is not equal to the surface value, and the inverse-square law applies only outside the sphere.

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