A) \[\frac{4{{\pi }^{2}}m{{r}^{2}}}{nh}\]
B) \[\frac{nh}{4{{\pi }^{2}}mr}\]
C) \[\frac{nh}{4{{\pi }^{2}}m{{r}^{2}}}\]
D) \[\frac{h}{2\pi mr}\]
Correct Answer: A
Solution :
It will take \[\frac{4{{\pi }^{2}}m{{r}^{2}}}{n\,h}\]
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