1.

If |vecA + vecB| = |vecA - vecB|, then the angle between vecA and vecB will be

Answer»

`theta=0`
`theta=45^(@)`
`theta=90^(@)`
`theta=180^(@)`

SOLUTION :`|vecA+VECB|=|vecA- vecB|`
S.B.S.
`|vecA+vecB|^(2)=|vecA-vecB|^(2)`
`(vecA+vecB)*(vecA+vecB)=(vecA-vecB)*(vecA-vecB)`
`THEREFORE theta=90^(@)`


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