A) \[\frac{\pi }{3}\]
B) \[\frac{2\pi }{3}\]
C) \[\frac{\pi }{6}\]
D) \[\frac{\pi }{4}\]
Correct Answer: B
Solution :
\[{{A}^{2}}=a_{1}^{2}+a_{2}^{2}+2{{a}_{1}}{{a}_{2}}\cos \phi \] (1) Here, \[\phi ={{\phi }_{1}}-{{\phi }_{2}},A={{a}_{1}}={{a}_{2}}=a\] Substituting these values in Eq. (1), we get\[\cos \phi =-\frac{1}{2}\] or \[\phi =\frac{2\pi }{3}\] Hence, the correction option is (b).You need to login to perform this action.
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