Question

The resultant of two vectors `vec(A)` and `vec(B)` is perpendicular to the vector `vec(A)` and its magnitudes is equal to half of the magnitudes of vector `vec(B)` (figure). The angle between `vec(A)` and `vec(B)` is

A. `120^(@)`
B. `150^(@)`
C. `135^(@)`
D. None of these

Answer 1

Correct Answer - B
`cos beta=R/B=1/2rArr beta= 60^(@)`
Angle between `vec(A)` and `vec(B)= 90^(@)+beta=150^(@)`