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 Share with your friends Share 0 Vijay Shankar Yadav answered this 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 -5 View Full Answer