A) \[~5545\overset{o}{\mathop{A}}\,\]
B) \[6025\overset{o}{\mathop{A}}\,\]
C) \[4925\overset{o}{\mathop{A}}\,\]
D) \[~4655\overset{o}{\mathop{A}}\,\]
Correct Answer: D
Solution :
[d] \[\beta =\frac{\lambda }{2\mu \tan \alpha }\simeq \frac{\lambda }{2\mu \alpha }\] \[\therefore \,\,\lambda =\beta \times 2\mu \alpha \] \[=0.12\times {{10}^{-2}}\times 2\times 1\times \left( \frac{40}{60\times 60}\times \frac{\pi }{180} \right)\] \[=4655\overset{o}{\mathop{A}}\,\].
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