\(\vec{A}\) is a vector quantity such that \(|\vec{A}|\) = non-zero constant. Which of the following expression is true for \(\vec{A}\) ?
1
\(\vec{A} \cdot \vec{A}=0\)
2
\(\vec{A} \times \vec{A}<0\)
3
\(\vec{A} \times \vec{A}=0\)
4
\(\vec{A} \times \vec{A}>0\)
5
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