NEET2006PhysicsMathematics in PhysicsActual
The vectors A and B are such that | A + B |=| A - B | . The angle between the two vectors is:
Options
- A45^
- B90^
- C60^
- D75^
Correct answer
B. 90^
Step-by-step solution
According to the question: aligned | A + B | & =| A - B | | A + B |^2 & =| A - B |^2 aligned aligned & A^2+B^2+2 A B=A^2+B^2-2 A B & 4 A B =0 & A B =0 & A B =0 & =90^ & [ As A=B 0] aligned