A) \[3{{A}^{2}}\]
B) \[5{{A}^{2}}\]
C) \[7{{A}^{2}}~\]
D) \[9{{A}^{2}}\]
Correct Answer: B
Solution :
\[{{A}^{R}}=\sqrt{a_{1}^{2}\,+\,a_{2}^{2}\,+\,2{{a}_{1}}{{a}_{2}}\,\cos \phi }\,\,=\,\,5{{A}^{2}}\]You need to login to perform this action.
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