Let and be three given vectors. Let be a vector in the plane of and whose projection on is . If , then is equal to :
- (A)6
- (B)7
- (C)8
- (D)9✓ Correct
Answer: (D)
Solution
Since is in the plane of and , write .
From : .
From projection: , so .
gives , or .
Solving: , so .
Therefore .
Answer: (D)
From : .
From projection: , so .
gives , or .
Solving: , so .
Therefore .
Answer: (D)
JEE Main · 2022 · 26 Jun 2022 · Shift 2 · Single correct option