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Q. Let $\vec{a}=5 \hat{i}-\hat{j}-3 \hat{k}$ and $\vec{b}=\hat{i}+3 \hat{j}+5 \hat{k}$ be two vectors. Then which one of the following statements is TRUE ?

JEE MainJEE Main 2023Vector Algebra

Solution:

$ \vec{ a }=5 \hat{ i }-\hat{ j }-3 \hat{ k } $
$ \vec{ b }=\hat{ i }-3 \hat{ j }+5 \hat{ k } $
$ \vec{ a } \cdot \hat{ b }=\frac{5-3-15}{\sqrt{35}}=-\frac{-13}{\sqrt{35}}$