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Two vectors vecA and vecB are such that ...

Two vectors `vecA` and `vecB` are such that `vecA+vecB=vecA-vecB`. Then

A

`45^(@)`

B

`90^(@)`

C

`60^(@)`

D

`75^(@)`

Text Solution

Verified by Experts

The correct Answer is:
B
(b): `(vecA+vecB)^(2)=(vecA-vecB)^(2)`
`|vecA|^(2)+|vecB|^(2)+2vecA.vecB=|vecA|^(2)+|vecB|^(2)-2vecA.vecB`
`4vecA.vecB=0`
`.^(4)|vecA||vecB| cos theta =0`
`|vecA|ne0, |vecB|ne0, theta=90^(@)`
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