First slide

Vectors

Question

What is the angle between $(\vec{P} + \vec{Q}) and (\vec{P} \times \vec{Q})$

Moderate

A

0
B

$\frac{π}{2}$
C

$\frac{π}{4}$
D

$π$

Solution

$Vector (\vec{P} + \vec{Q}) lies in a plane and vector (\vec{P} \times \vec{Q})$ is perpendicular to this plane i.e., the angle between given vectors is $\frac{π}{2}$

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