Question

Two vectors `vec(A) and vec(B)` inclined at an angle `theta` have a resultant `vec(R )` which makes an angle `alpha` with `vec(A)`. If the directions of `vec(A) and vec(B)` are interchanged, the resultant will have the same
A. direction
B. magnitude
C. direction as well as magnitude
D. None of these

Answer 1

Correct Answer - B
Neither the magnitude of vector nor the angle between the vector is changed. So magnitude of the resultant remains unchanged. Howerver the direction of the resultatnt will be changed.