In hydrogen atom, the electron is making $6.6 \times {10^{15}}\,rev/\sec $ around the nucleus in an orbit of radius $0.528\, \mathop A\limits^o $. The magnetic moment $(A - {m^2})$ will be
  • A$1 \times {10^{ - 15}}$
  • B$1 \times {10^{ - 10}}$
  • C$1 \times {10^{ - 23}}$
  • D$1 \times {10^{ - 27}}$
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