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A hollow metallic sphere of radius $r$ is kept at potential of $1$ $Volt$. The total electric flux coming out of the concentric spherical surface of radius $R ( > r)$ is

  1. $4\pi \epsilon _0r$
  2. $4\pi \epsilon _0r^2$
  3. $4\pi \epsilon _0R$
  4. $4\pi \epsilon _0R^2$
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