Question

The resultant of two vectors A and
B is perpendicular to A and equal to
half of the magnitude of B. The angle
between A and B is
(A) 120°
(B) 150
(C) 90°
(D) 1350​

Answer 1

Given, result vector of a and b is perpendicular to a and its magnitude is half of b.

Now, direction of vector in triangle law of addition is unique direction of each vector.so,angle between two is 180- c.let c is angle between two given line.since required angle is angle between two vector are in same plane which is 180-c.hence using sinc=mag(resultant/vector b)=b/2/b=1/2,c=30,hence 180-c=180–30=150

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