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

माना दो सदिश \(\overrightarrow{ a }=\hat{ i }-2 \hat{ j }+\hat{ k }\) तथा \(\overrightarrow{ b }=\hat{ i }-\hat{ j }+\hat{ k }\) हैं। यदि एक सदिश \(\overrightarrow{ c }\) इस प्रकार है कि \(\overrightarrow{ b } \times \overrightarrow{ c }=\overrightarrow{ b } \times \overrightarrow{ a }\) तथा \(\overrightarrow{ c } \cdot \overrightarrow{ a }=0\) हैं, तो \(\overrightarrow{ c } \cdot \overrightarrow{ b }\) बराबर है 

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

(C) \(-\frac{1}{2}\)

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\(\overrightarrow{\mathrm{b}} \times \overrightarrow{\mathrm{c}}-\overrightarrow{\mathrm{b}} \times \overrightarrow{\mathrm{a}}=\overrightarrow{0}\) \(\overrightarrow{\mathrm{b}} \times(\overrightarrow{\mathrm{c}}-\overrightarrow{\mathrm{a}})=\overrightarrow{0}\)…
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