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

माना \(\vec{a}=6 \hat{i}+\hat{j}-\hat{k}\) और \(\vec{b}=\hat{i}+\hat{j}\)। यदि \(\vec{c}\) एक सदिश है इस प्रकार कि \(|\vec{c}| \geq 6, \vec{a} \cdot \vec{c}=6|\vec{c}|,|\vec{c}-\vec{a}|=2 \sqrt{2}\) और \(\vec{a} \times \vec{b}\) तथा \(\vec{c}\) के बीच का कोण \(60^{\circ}\) है, तो \(|(\vec{a} \times \vec{b}) \times \vec{c}|\) = ...........

  1. A  \(\frac{9}{2}(6-\sqrt{6})\)
  2. B \(\frac{3}{2} \sqrt{3}\)
  3. C \(\frac{3}{2} \sqrt{6}\)
  4. D \(\frac{9}{2}(6+\sqrt{6})\)
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Correct Answer

(D) \(\frac{9}{2}(6+\sqrt{6})\)

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\( |(\overrightarrow{\mathrm{a}} \times \overrightarrow{\mathrm{b}} \times \overrightarrow{\mathrm{c}})|=|\overrightarrow{\mathrm{a}} \times \overrightarrow{\mathrm{b}}||\overrightarrow{\mathrm{c}}| \frac{\sqrt{3}}{2} \) \( |\overrightarrow{c}-\overrightarrow{a}|=2 \sqrt{2} \)…
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