A) \[\mu \operatorname{mg}\]
B) \[\sqrt{\frac{1+{{\mu }^{2}}}{\mu }}\operatorname{mg}\]
C) \[\mu \sqrt{1+{{\mu }^{2}}}\operatorname{mg}\]
D) \[\frac{\mu \operatorname{mg}}{\sqrt{1+{{\mu }^{2}}}}\]
Correct Answer: D
Solution :
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