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The electrostatic potential inside a charged sphere is given as $V = Ar^2 + B,$ where $r$ is the distance from the centre of the sphere; $A$ and $B$ are constants. Then the charge density in the sphere is$.......$

• A
  $20 A \varepsilon_0$
• ✓
  $-6 A \varepsilon_0$
• C
  $16 A \varepsilon_0$
• D
  $-15 A \varepsilon_0$