First slide

Scalars and Vectors

Question

What can be the angle between $(\vec{P} + \vec{Q}) and (\vec{P} - \vec{Q}) ?$

Moderate

A

90^o
B

0^o only
C

any angle between 0^o and 180^o
D

180^oonly

Solution

$β$ is the angle between $\vec{P} + \vec{Q} and \vec{P} - \vec{Q}$ . $β$ can have any value from 0^o to 180^o depending upon magnitudes of $\vec{P} and \vec{Q}$ and angle $θ$ between them.

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