# 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) $\frac{B}{2}$ (2) $\frac{B}{8}$ (3) $\frac{B}{16}$ (4) $\frac{B}{32}$

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