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If |vecP+vecQ|=|vecP|-|vecQ|, the the an...

If `|vecP+vecQ|=|vecP|-|vecQ|`, the the angle between the vectors `vecPandvecQ`

A

`0^(@)`

B

`45^(@)`

C

`90^(@)`

D

`180^(@)`

Text Solution

Verified by Experts

Square on both sides, and the resultants become,
`P^(2)+Q^(2)+2PQcostheta=P^(2)+Q^(2)-2PQcostheta`
`4PQcostheta=0" "theta=90^(@)`
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