A) \[4\,m\,{{s}^{-2}}\]
B) \[-\,4\,m\,{{s}^{-2}}\]
C) \[-2\,m\,{{s}^{-2}}\]
D) \[2\,m\,{{s}^{-2}}\]
Correct Answer: B
Solution :
As \[F\bot B\] Hence, \[a\bot B\] \[\therefore \,\,\,\overrightarrow{a}\,.\,\overrightarrow{B}=0\] \[\Rightarrow \,\,\left( x\hat{i}+2\hat{j} \right)\,.\,\left( 2\hat{i}+4\hat{j} \right)=0\] \[2x+8=0\,\,\Rightarrow x=-4\,m\,{{s}^{-2}}\]
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