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JEE Mains · Maths · STD 12 - 10. vector algebra

यदि सदिशों \(\hat{ i }+\lambda \hat{ j }+\hat{ k }, \hat{ j }+\lambda \hat{ k }\) तथा \(\lambda \hat{ i }+\hat{ k }\) द्वारा बनाये गये समान्तर षट्फलक (parallelopiped) का आयतन न्यूनतम है, तो \(\lambda\) बराबर है

  1. A \(\sqrt 3 \)
  2. B \(\frac{1}{{\sqrt 3 }}\)
  3. C \(-\frac{1}{{\sqrt 3 }}\)
  4. D None of these
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Correct Answer

(D) None of these

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Volume of paralleopiped \( = \left\| {\begin{array}{*{20}{l}} 1&\lambda &1\\ 0&1&\lambda \\ \lambda &0&1 \end{array}} \right\|\) \(f(\lambda)=\left|\lambda^{3}-\lambda+1\right|\) Its graphs as follows where \(\lambda=-1.32\) For minimum value of volume of paralelopiped and…
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