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$A$ and $B$ are two concentric spheres. If $A$ is given a charge $Q$ while $B$ is earthed as shown

• A
  The charge density of $A$ and $B$ are same
• B
  The field inside and outside $A$ is zero
• ✓
  The field between $A$ and $B$ is not zero
• D
  The field inside and outside $B$ is zero