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If vectors vec A= cos omega t hat i + si...

If vectors `vec A= cos omega t hat i + sin omega t hat j` and `vecB= cos ((omega t)/2) hat i +sin ((omega t)/(2)) hat j` are functions of time then the value of t at which they are orthogonal to each other is (A) `t=pi/w` (B) `t=0` (C) `t=pi/(4w)` (D) `t=pi/(2w)`

A

`t = (pi)/omega`

B

t = 0

C

`t = pi/(4omega)`

D

`t = pi/(2omega)`

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