A hollow metal sphere of radius $5\, cm$ is charged so that the potential on its surface is $10\, V$. The potential at the centre of the sphere is

  • [IIT 1983]
  • A

    $0\, V$

  • B

    $10\, V$

  • C

    Same as at point $5\, cm$ away from the surface

  • D

    Same as at point $25\, cm$ away from the surface

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  • [JEE MAIN 2023]

Two insulated charged conducting spheres of radii $20\,cm$ and $15\,cm$ respectively and having an equal charge of $10\,C$ are connected by a copper wire and then they are separated. Then