1.

If the angle theta between the vectors veca=2x^(2)hati+4xhatj+hatk and overset(-)b=7hati-2hatj+xhatk is such that 90^(@) lt theta lt 180^(@), then x lies in the interval

Answer»

`(0,1/2)`
`(1/2,1)`
`(1,3/2)`
`(1/2,3/2)`

ANSWER :A


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