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

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Vectors which is perpendicular to `( a cos theta hat (i) + b sin theta hat(j))` is
A. `(1) 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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Correct Answer - D
Dot produced of `(a cos theta hat(i) + b sin theta hat(j))` with `(a) , (b)` and `( c)` is zero.
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