MCQ
सदिश $\frac{1}{\sqrt{3}} \hat{i}+\frac{1}{\sqrt{3}} \hat{j}-\frac{1}{\sqrt{3}} \hat{k}$ का परिमाण है-
  • A
    3
  • 1
  • C
    $-1$
  • D
    2

Answer

Correct option: B.
1
(B) 1
परिमाण $=\left|\frac{1}{\sqrt{3}} \hat{i}+\frac{1}{\sqrt{3}} \hat{j}-\frac{1}{\sqrt{3}} \hat{k}\right|$
$\begin{array}{l}=\sqrt{\left(\frac{1}{\sqrt{3}}\right)^2+\left(\frac{1}{\sqrt{3}}\right)^2+\left(\frac{-1}{\sqrt{3}}\right)^2}=\sqrt{\frac{1}{3}+\frac{1}{3}+\frac{1}{3}} \\ =1\end{array}$
अतः सही विकल्प (B) है।

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