Which of the following statements about Bohr theory of hydrogen atom is not correct?

Which of the following statements about Bohr theory of hydrogen atom is not correct?

A
Centripetal force acting on the electron is $Z e^{2} / (4 π ε_{0} r)$ .
B
Centrifugal force acting on the electron is $m v^{2} / r$
C
Angular momentum of electron is $n (h / 2 π)$
D
Bohr radius is equal to 52.9 pm.

Solution:

Centripetal force is

$Z e^{2} / (4 π ε_{0} r^{2})$ .

This force is similar to the expression given in option A.

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