Given ${\rm{\vec P}} = 3\hat j + 4\hat k\,and\,{\rm{\vec Q}} = 2\hat i + 5\hat k$. The magnitude of the scalar product of these vectors is

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Given

\mathrm{\vec P} = 3\hat j + 4\hat k\,and\,\mathrm{\vec Q} = 2\hat i + 5\hat k

. The magnitude of the scalar product of these vectors is

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Correct option: A

Option A (20) is correct because it is the scalar product of the two vectors.

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\mathrm{\vec a}\,and\,\mathrm{\vec b}

\mathrm{\vec a}\,and\,\mathrm{\vec b}

\overrightarrow P \,\,.\,\,\overrightarrow Q = 0\,and\,\overrightarrow P \,\, \times \,\,\overrightarrow Q = 0

\overrightarrow Q \,and\,\overrightarrow R

\vec{A}=3 \hat{i}+4 \hat{j}

\vec{B}=6 \hat{i}+8 \hat{j}

A

B

\overrightarrow{\mathrm{A}}

\overrightarrow{\mathrm{B}}

{\cot ^{ - 1}}\left( 2 \right)