NEET2007PhysicsMathematics in PhysicsActual
A and B are two vectors and is the angle between them, if | A B |= 3 ( A B ) , the value of is.
Options
- A45^
- B30^
- C90^
- D60^
Correct answer
D. 60^
Step-by-step solution
Finding the angle between the vectors: ( aligned & | A B |= 3 ( AB ) & | A || B | ( )= 3 | ~A || B | ( ) aligned ) Cancelling both sides we get ( aligned & ( )= 3 ( ) & ( ) ( ) = 3 & ( )= 3 aligned ) Hence ( =60^ ) Hence the angle between A and B is (60^ )