Question

The angle subtended by vector `vec(i)+vec(j)` with x-axis is :-
A. `(pi)/(6)`
B. `(pi)/(4)`
C. `(pi)/(3)`
D. `(2pi)/(3)`

Answer 1

Correct Answer - B
Let `hat(i)` be unit vector along x-axis
` i.(hat(i)hat(j))=1xxsqrt(2) cos theta`
`rArr " " Cos theta =(1)/(sqrt(2))`
`rArr " " theta=(pi)/(4)`