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A hollow charged metal sphere has radius r . If the potential difference between its surface and a point at a distance 3r from the centre is V, then electric field intensity at a distance 3r is

  1. fraction numerator V over denominator 2 r end fraction
  2. fraction numerator V over denominator 3 r end fraction
  3. fraction numerator V over denominator 6 r end fraction
  4. fraction numerator V over denominator 4 r end fraction

The correct answer is: fraction numerator V over denominator 6 r end fraction

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