$A$ charge $+q$ is placed somewhere inside the cavity of a thick conducting spherical shell of inner radius $R_1$ and outer radius $R_2$. $A$ charge $+Q$ is placed at a distance $r > R_2$ from the centre of the shell. Then the electric field in the hollow cavity

  • A
    depends on both $+q$ and $+Q$
  • B
    is zero
  • C
    is only that due to $+Q$
  • D
    is only that due to $+q$

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