Question

13. If |A-BI=|A|=IB|, the angle between A and B is
.
(a) 60°
(b) 0°
(c) 120°
(d) 90°​

Answer 1

Answer:

Explanation:

A x B =| A ||B| sinα n, where α is the angle between A & B and n is the unit vector perpendicular to the plane containing A & B . So, the angle between (A+B) and (A x B) is 90° .