If | 
+ 
| = | 
| = | 
|, then the angle between 
and 
is
Text Solution
Verified by ExpertsThe correct answer is:
D
| 
+ 
| = | 
| = | 
|
Case -I Either | 
| = | 
| = 0 (zero vectors)
Case - 
II |A| = |B| ≠ 0
| 
+ 
| = A2 + B2 + AB cos θ
|A| = |B|
= 2A2 + 2A2 cos θ = 2A2 (1 + cos θ )
= 2A (2cos2 
) = 4A cos2 
Now |A + B| = A
cos 
= 
= 60°
θ = 120°
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