The magnetic induction due to the electron revolving in the first Bohr orbit of hydrogen atom at the centre of the orbit is B. If the electron is revolving in the second Bohr orbit the magnetic induction at the centre will be

Explanation

`B=(mu_(0)i)/(2r)rArrB=(mu_(0))/(2r)rArr(qv)/(2pir)`
According Bohr.s theory of hydrogen atom,
`Bpropv/(r^(2))}_(vprop1/n)^(rpropn^(2))`