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NDA 2014
Exam
NDA
Year
2014
Subject
Mathematics
Chapter
Vector Algebra

NDA 2014 · Mathematics · Vector Algebra

If | a + b |=| a - b | , then which one of the following is correct?

If ∣a⃗+b⃗∣=∣a⃗−b⃗∣|\vec{a}+\vec{b}|=|\vec{a}-\vec{b}|, then which one of the following is correct?

Options

  1. A∣a⃗∣=∣b⃗∣|\vec{a}|=|\vec{b}|
  2. Ba⃗\vec{a} is parallel to b⃗\vec{b}
  3. Ca⃗\vec{a} is perpendicular to b⃗\vec{b}
  4. Da⃗\vec{a} is a unit vector

Correct answer

C. a⃗\vec{a} is perpendicular to b⃗\vec{b}

Step-by-step solution

The correct answer is option (C)
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