The gyro-magnetic ratio of an electron in an H-atom, according to Bohr model, is

Options

A. independent of which orbit it is in
B. negative
C. positive
D. increases with the quantum number n

Answer

A, B

Explanation

Consider the electron of mass m, charge e be revolving in nth orbit of hydrogen atom. According to Bohr's theory, angular momentum of electron `(L)=nh//2pi`.
Magnetic moment of electron, `M=nxx`Bohr magneton`=n[eh//(4pim)]`
Gyromagnetic ratio=magnetic moment/angular momentum`=(n eh//(4pim))/(nh//(2pi))=(e)/(2m)=`a constant
As value of e is negative, so gyromagnetic ratio is negative.