A sphere of radius $R$ and charge $Q$ is placed inside an imaginary sphere of radius $2R$ whose centre coincides with the given sphere. The flux related to imaginary sphere is

  • A

    $\frac{Q}{{ \in _0}}$

  • B

    $\frac{Q}{{2 \in _0}}$

  • C

    $\frac{4Q}{{ \in _0}}$

  • D

    $\frac{2Q}{{ \in _0}}$

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