A) \[45{}^\circ \]
B) \[120{}^\circ \]
C) \[150{}^\circ \]
D) \[{{60}^{\text{o}}}\]
Correct Answer: B
Solution :
\[F=\sqrt{{{(F)}^{2}}+{{(F)}^{2}}+2F.F\cos \theta }\]Þ \[\theta =120{}^\circ \]
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