JEE Main · 2026 · 23 Jan 2026 · Shift 2 · Vector Algebra

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Let and . If and the length of the projection of on is , then is equal to :
  1. (A)9
  2. (B)6
  3. (C)4
  4. (D)12✓ Correct

Answer: (D)

Solution

Compute . The condition gives , so and . The length of the projection of on is . Therefore .

JEE Main · 2026 · 23 Jan 2026 · Shift 2 · Single correct option

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