A) \[{{45}^{o}}\]
B) \[{{180}^{o}}\]
C) \[{{90}^{o}}\]
D) \[{{60}^{o}}\]
Correct Answer: B
Solution :
Given, \[\vec{a}.\vec{b}=-|\vec{a}||\vec{b}|\] \[\Rightarrow \] \[|\vec{a}||\vec{b}|\cos \theta =-|\vec{a}||\vec{b}|\] \[\Rightarrow \] \[\cos \theta =-1\] \[\Rightarrow \] \[\theta ={{180}^{o}}\]You need to login to perform this action.
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