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Vectors which is perpendicular to ( a co...

Vectors which is perpendicular to `( a cos theta hat (i) + b sin theta hat(j))` is

A

`b sin theta hat(i)- a cos theta hat(j)`

B

`(1)/(a) sin theta hat(i)- (1)/(b) cos theta hat(j)`

C

`5 hat(k)`

D

All of these

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The correct Answer is:
D
If two vectors perpendicular, Then, dot product is zero
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