A) \[^{66}Cu,\]
B) \[7\frac{1}{2}\]
C) \[{{\mu }_{k}}=1-\frac{1}{{{n}^{2}}}\]
D) \[{{\mu }_{k}}=\sqrt{1-\frac{1}{{{n}^{2}}}}\]]
Correct Answer: A
Solution :
When friction is absent \[{{R}^{2}}\] \[{{R}_{1}}\] \[{{R}_{2}}\] ?..(i) When friction is present \[({{R}_{2}}>{{R}_{1}})\] \[{{R}_{2}}\] \[R=\frac{{{R}_{2}}\times ({{R}_{1}}+{{R}_{2}})}{({{R}_{2}}-{{R}_{1}})}\] ?..(ii) From Eqs. (i) and (ii) \[R={{R}_{2}}-{{R}_{1}}\] or \[R=\frac{{{R}_{1}}{{R}_{2}}}{({{R}_{1}}+{{R}_{2}})}\] (\[R=\frac{{{R}_{1}}{{R}_{2}}}{({{R}_{2}}-{{R}_{1}})}\] \[{{\sin }^{2}}(\omega t)\]0) or \[2\pi /\omega \] or \[\pi /\omega \] or \[2\pi /\omega \] or \[\pi /\omega \] or \[\frac{4}{3}\]
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