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

माना \(\vec{a}\) तथा \(\vec{b}\) दो शून्येत्तर सदिश हैं जो एक दूसरे के लंबवत हैं तथा \(|\overrightarrow{ a }|=|\overrightarrow{ b }|\) है \(\mid\) यदि \(|\overrightarrow{ a } \times \overrightarrow{ b }|=|\overrightarrow{ a }|\) है, तो सदिशों \((\overrightarrow{ a }+\overrightarrow{ b }+(\overrightarrow{ a } \times \overrightarrow{ b }))\) तथा \(\overrightarrow{ a }\) के बीच का कोण बराबर है

  1. A \(\sin ^{-1}\left(\frac{1}{\sqrt{3}}\right)\)
  2. B \(\cos ^{-1}\left(\frac{1}{\sqrt{3}}\right)\)
  3. C \(\cos ^{-1}\left(\frac{1}{\sqrt{2}}\right)\)
  4. D \(\sin ^{-1}\left(\frac{1}{\sqrt{6}}\right)\)
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Answer & Solution

Correct Answer

(B) \(\cos ^{-1}\left(\frac{1}{\sqrt{3}}\right)\)

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Detailed explanation

\(|\overrightarrow{ a }|=|\overrightarrow{ b }|,|\overrightarrow{ a } \times \overrightarrow{ b }|=|\overrightarrow{ a }|, \overrightarrow{ a } \perp \overrightarrow{ b }\)…
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