CBSE

MATHEMATICS · Single correct · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

(r⋅i^)2+(r⋅j^)2+(r⋅k^)2(\mathbf{r}\cdot\hat{i})^2+(\mathbf{r}\cdot\hat{j})^2+(\mathbf{r}\cdot\hat{k})^2 is equal to (1) 3r23r^2 (2) r2r^2 (3) 00 (4) None of these

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