1.

Let `vec(A)=hat(i)A cos theta+hat(j)A sin theta`, be any vector. Another vector `vec(B)` which is normal to `vec(A)` is :-A. `B costheta hati +B sin thetahatj`B. `B sin theta hati +B cos thetahatj`C. `B sin theta hati - B cos thetahatj`D. `A cos theta hati - A cos thetahatj`

Answer» Correct Answer - C
`vec(A)= A cos theta hati +A sin theta J`
We must have `vecA.vecB=0,`
which is cleaely satisfied by
`vec(B) =B sin theta hati -A cos theta hatj.`


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