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CUET · MATHS · PYQ PAPER 2025

If \(|\vec{a}|=a\), then the value of \(|\vec{a} \times \hat{i}|^2+|\vec{a} \times \hat{j}|^2+|\vec{a} \times \hat{k}|^2\) is :

  1. A \(a^2\)
  2. B \(2 a^2\)
  3. C 0
  4. D \(3 a^2\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(2 a^2\)

Step-by-step Solution

Detailed explanation

\(|\vec{a} \times \hat{i}|^2 = |\vec{a}|^2 |\hat{i}|^2 - (\vec{a} \cdot \hat{i})^2 = a^2(1)^2 - a_x^2 = a^2 - a_x^2\) \(|\vec{a} \times \hat{j}|^2 = a^2 - a_y^2\) \(|\vec{a} \times \hat{k}|^2 = a^2 - a_z^2\)…
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