1.

The unit vector along `vec(A)= 2 hat i + 3 hat j` is :A. `2 hat i+ 3 hat j`B. `(2 hati +3 hatj)/(2)`C. `(2 hati +3 hatj)/(3)`D. `(2 hati+3hatj)/(sqrt(13))`

Answer» Correct Answer - D
`vec(A)=2 hati+3 hatj rArr vec(A)-A hat(A)`
`hat(A) =(2hat i+3hatj)/(sqrt(4+9))=(2 hati+3 hat j)/(sqrt(13))`.


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