A) \[r=\frac{{{n}^{2}}{{h}^{2}}}{4{{\pi }^{2}}m{{e}^{4}}{{z}^{2}}}\]
B) \[r=\frac{{{n}^{2}}{{h}^{2}}}{4{{\pi }^{2}}m{{e}^{2}}z}\]
C) \[r=\frac{{{n}^{2}}{{h}^{2}}}{4{{\pi }^{2}}m{{e}^{2}}{{z}^{2}}}\]
D) \[r=\frac{{{n}^{2}}{{h}^{2}}}{4{{\pi }^{2}}{{m}^{2}}{{e}^{2}}{{z}^{2}}}\]
Correct Answer: B
Solution :
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