(A) The dot product of two vectors $\vec{P}$ and $\vec{Q}$ is defined as $\vec{P} \cdot \vec{Q} = PQ \cos \theta$,where $\theta$ is the angle between

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(A) The dot product of two vectors $\vec{P}$ and $\vec{Q}$ is defined as $\vec{P} \cdot \vec{Q} = PQ \cos \theta$,where $\theta$ is the angle between the vectors.Given that $\vec{P} \cdot \vec{Q} = PQ$.Substituting this into the formula: $PQ = PQ \cos \theta$.Dividing both sides by $PQ$ (assuming $P, Q \neq 0$),we get $\cos \theta = 1$.Since $\cos 0^\circ = 1$,the angle $\theta = 0^\circ$.

Class 11 Chemistry Data Entry - Chemistry Level 0 of all question bank

If $\vec{P} \cdot \vec{Q} = PQ$,then the angle between $\vec{P}$ and $\vec{Q}$ is ............. $^\circ$.

AIIMS 1999 All AIIMS

A
$0$
B
$30$
C
$45$
D
$60$

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If $\vec{P} \cdot \vec{Q} = PQ$,then the angle between $\vec{P}$ and $\vec{Q}$ is ............. $^\circ$.

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