$A$ hollow metal sphere is charged with a charge of $3.2 \times 10^{-19} \ C$. If the radius of the sphere is $10 \ cm$,then the electric potential at a distance of $4 \ cm$ from its center will be:

  • A
    $9 \times 10^{-9} \ V$
  • B
    $28.8 \times 10^{-9} \ V$
  • C
    $28.8 \times 10^{-8} \ V$
  • D
    $28.8 \ V$

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