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

मान लीजिए \(\vec{a}=\hat{i}+2 \hat{j}+\hat{k}\) और \(\vec{b}=2 \hat{i}+\hat{j}-\hat{k}\) हैं। मान लीजिए \(\hat{c}\) सदिशों \(\vec{a}\) और \(\vec{b}\) के समतल में एक मात्रक सदिश है तथा \(\vec{a}\) के लंबवत है। तब ऐसा सदिश \(\hat{c}\) ___ है :

  1. A \(\frac{1}{\sqrt{5}}(\hat{\mathrm{j}}-2 \hat{\mathrm{k}})\)
  2. B \(\frac{1}{\sqrt{3}}(-\hat{\mathrm{i}}+\hat{\mathrm{j}}-\hat{\mathrm{k}})\)
  3. C \(\frac{1}{\sqrt{3}}(\hat{\mathrm{i}}-\hat{\mathrm{j}}+\hat{\mathrm{k}})\)
  4. D \(\frac{1}{\sqrt{2}}(-\hat{\mathrm{i}}+\hat{\mathrm{k}})\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(\frac{1}{\sqrt{2}}(-\hat{\mathrm{i}}+\hat{\mathrm{k}})\)

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Detailed explanation

Let vector \(\vec{p}\) in plane of \(\vec{a} \& \vec{b}=K(\vec{a}+\lambda \vec{b})\)…
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