What can be the angle between (→P+→Q) and (→P−→Q)?
A
0°only
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B
Any angle between 0° and 180°
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C
180° only
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D
90°
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Solution
The correct option is B Any angle between 0° and 180° Drow a diagram of given situation.
Find angle between (→P+→Q) and (→P−→Q).
(→P+→Q) and (→P−→Q) are diagonals of a paralleiogram whose sides are →P and →Q. β is the angle between →P+→Q and →P−→Q. β can have any value from 0∘ to180∘ depending upon magnitudes of →P and →Q and angle Θ between them.