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

અહી સદીશો \(\vec{a}, \vec{b}, \vec{c}\)  સમાન મૂલ્યના અને પરસ્પર લંબ છે. જો સદીશ \(\overrightarrow{\mathrm{r}}\) એ  \(\overrightarrow{\mathrm{a}} \times\{(\overrightarrow{\mathrm{r}}-\overrightarrow{\mathrm{b}}) \times \overrightarrow{\mathrm{a}}\}+\overrightarrow{\mathrm{b}} \times\{(\overrightarrow{\mathrm{r}}-\overrightarrow{\mathrm{c}}) \times \overrightarrow{\mathrm{b}}\}+\overrightarrow{\mathrm{c}} \times\{(\overrightarrow{\mathrm{r}}-\overrightarrow{\mathrm{a}}) \times \overrightarrow{\mathrm{c}}\}=\overrightarrow{0}\) નું સમાધાન કરે છે તો  \(\overrightarrow{\mathrm{r}}\) મેળવો.

  1. A \(\frac{1}{3}(\vec{a}+\vec{b}+\vec{c})\)
  2. B \(\frac{1}{3}(2 \overrightarrow{\mathrm{a}}+\overrightarrow{\mathrm{b}}-\overrightarrow{\mathrm{c}})\)
  3. C \(\frac{1}{2}(\vec{a}+\vec{b}+\vec{c})\)
  4. D \(\frac{1}{2}(\vec{a}+\vec{b}+2 \vec{c})\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\frac{1}{2}(\vec{a}+\vec{b}+\vec{c})\)

Step-by-step Solution

Detailed explanation

Suppose \(\overrightarrow{\mathrm{r}}=\mathrm{x} \overrightarrow{\mathrm{a}}+\mathrm{yb}+2 \overrightarrow{\mathrm{c}}\) and \(|\overrightarrow{\mathrm{a}}|=|\overrightarrow{\mathrm{b}}|=|\overrightarrow{\mathrm{c}}|=\mathrm{k}\)…
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