The value of if $\vec{a}=3 i, \vec{b}=4 j$ then magnitude of $\vec{a} \cdot \vec{b}$ is

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Professor PC Thomas Classes · Answer

$\vec{a} \cdot \vec{b} = (3\hat{i}) \cdot (4\hat{j}) = 12(\hat{i} \cdot \hat{j}) = 0$