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What can be the angle between vec P + ve...

What can be the angle between `vec P + vec Q and vec P - vec Q` ?

A

`0^(@)` only

B

`90^(@)` only

C

`180^(@)` only

D

between `0^(@) and 180^(@)`

Text Solution

Verified by Experts

The correct Answer is:
A
`cos theta = (( vec P + vec Q) xx ( vec P - vec Q ))/( | vec P + vec Q|| vec P - vec Q|) = ( P ^(2) + Q ^(2) - 2 PQ )/( P ^(2) + Q ^(2) - 2 PQ) =1 `
`implies theta = 0^(@).`
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