A) \[30{}^\circ \]
B) \[45{}^\circ \]
C) \[60{}^\circ \]
D) None of these
Correct Answer: B
Solution :
\[{{K}_{4}}=K{{\cos }^{2}}\theta =\frac{K}{2}\] \[\cos \theta =\frac{1}{\sqrt{2}}\] \[\cos \theta =\cos 45{}^\circ \Rightarrow \theta =45{}^\circ \]You need to login to perform this action.
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