In Bohr's theory of the hydrogen atom,'$r$' is the radius of the orbit,'$V$' is the speed of the electron, and '$E$' is the total energy of the electron. Which of the following physical quantities is inversely proportional to the principal quantum number '$n$'?

  • A
    $1/Vr$
  • B
    $Vr$
  • C
    $V^2r$
  • D
    $Vr^2$

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