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 :
- A \(a^2\)
- B \(2 a^2\)
- C 0
- D \(3 a^2\)
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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