A) \[30{}^\circ <{{i}_{b}}<45{}^\circ \]
B) \[45{}^\circ <{{i}_{b}}<90{}^\circ \]
C) \[{{i}_{b}}=90{}^\circ \]
D) \[0{}^\circ <{{i}_{b}}<30{}^\circ \]
Correct Answer: B
Solution :
| [b] \[\mu =\tan \,{{i}_{b}}\] |
| \[1<\mu <\infty \] |
| \[1<\tan \,{{i}_{b}}<\infty \] |
| \[{{\tan }^{-1}}(1)<{{i}_{b}}<{{\tan }^{-1}}(\infty )\] |
| \[45{}^\circ <{{i}_{b}}<90{}^\circ \] |
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