Let 
be three unit vectors, out of which vectors 
and 
are non-parallel. If 
and 
are the angles which vector 
makes with vectors 
and 
respectively and 
, then |
−
| is equal to:
(a)
60°
(b)
30°
(c)
90°
(d)
45°
Let be three unit vectors, out of which vectors and are non-parallel. If and are the angles which vector makes with vectors and respectively and , then | − | is equal to:
(a)
60°
(b)
30°
(c)
90°
(d)
45°
Question ID - 57346 | SaraNextGen Top Answer
Let be three unit vectors, out of which vectors and are non-parallel. If and are the angles which vector makes with vectors and respectively and , then | − | is equal to:
(a)
60°
(b)
30°
(c)
90°
(d)
45°
|
Let |
|||
|
(a) |
60° |
(b) |
30° |
|
(c) |
90° |
(d) |
45° |
1 Answer
127 votes
Answer Key / Explanation : (b) -
(
– 
are linearly independent
∴ 
=0
(All given vectors are unit vectors)
∴
= 60° & 
= 90°
∴ |
| = 30°
127 votes
Answer Link
127