JEE Main · 2022 · 26 Jun 2022 · Shift 2 · Vector Algebra

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Let and be three given vectors. Let be a vector in the plane of and whose projection on is . If , then is equal to :
  1. (A)6
  2. (B)7
  3. (C)8
  4. (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)

JEE Main · 2022 · 26 Jun 2022 · Shift 2 · Single correct option

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