3-1.Vectors
easy

निम्न में से कौनसा $\mathop A\limits^ \to $ तथा $\overrightarrow B $ के लम्बवत् एकांक सदिश है

A

$\frac{{\hat A \times \hat B}}{{AB\,\sin \theta }}$

B

$\frac{{\hat A \times \hat B}}{{AB\,\cos \theta }}$

C

$\frac{{\mathop A\limits^ \to \times \mathop B\limits^ \to }}{{AB\,\sin \theta }}$

D

$\frac{{\overrightarrow A \times \overrightarrow B }}{{AB\,\cos \theta }}$

Solution

(c) $A$ तथा $B$ के लम्बवत् सदिश, $\mathop A\limits^ \to \times \mathop B\limits^ \to = AB\sin \theta \;\hat n$

$\therefore A$ तथा $B$ के लम्बवत् एकांक सदिश $\hat n = \frac{{\mathop A\limits^ \to \times \mathop B\limits^ \to }}{{|\mathop A\limits^ \to | \times |\mathop B\limits^ \to |\sin \theta }}$

Standard 11
Physics

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