A) \[{{\mu }_{k}}=1-\frac{1}{{{n}^{2}}}\]
B) \[{{\mu }_{k}}=\sqrt{1-\frac{1}{{{n}^{2}}}}\]
C) \[{{\mu }_{s}}=1-\frac{1}{{{n}^{2}}}\]
D) \[{{\mu }_{s}}=\sqrt{1-\frac{1}{{{n}^{2}}}}\]
Correct Answer: A
Solution :
[a] The situation is shown in figure when friction is absent, |
.(i) |
When friction is present |
...(ii) |
Whens |
From Eqs. (i) and (ii), we get |
or |
(given in question) |
or |
or |
or |
or or |
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