Which of the following equations gives the angular momentum of an electron in a stationary orbit?
- A$mvr = \frac{2 \pi}{h} \times n$
- B$mvr = \frac{nh}{2 \pi}$
- C$mvh = n \times \frac{r}{2 \pi}$
- D$mv = \left( \frac{h \times r}{2 \pi} \right) n$
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