Solve this.
Q. An electron revolving in the Bohr's first orbit of hydrogen atom produces magnetic field B at the nucleus. If this electron jumps to second orbit and revolves, then field at the nucleus will be
(1) B 2
(2) B 8
(3) B 16
(4) B 32

Dear Student,
                      We can take moving  electron around nucleus as a ring of current =eT=ev2πrSo field at centre=μ0I2r=μ0ev4πr2=Bhere r directly proportinal to n2and v inversly proportinal to nso B inversely proportional to n3So now field will be B/8
Regards
                      

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