3-1.Vectors
easy

दो सदिश $\mathop A\limits^ \to $ तथा $\mathop B\limits^ \to $ एक दूसरे के लम्बवत होंगे जबकि

A

$\mathop A\limits^ \to + \mathop B\limits^ \to = 0$

B

$\mathop A\limits^ \to - \mathop B\limits^ \to = 0$

C

$\mathop A\limits^ \to \times \mathop B\limits^ \to = 0$

D

$\mathop A\limits^ \to \,.\,\mathop B\limits^ \to = 0$

(AIIMS-1987)

Solution

(d) $\overrightarrow {\;A} .\overrightarrow {\;B} = \,|\overrightarrow {\;A} |.|\overrightarrow {\;B} |.\cos \theta = \overrightarrow {\;A} .\overrightarrow {\;B} .\cos 90^\circ = 0$

Standard 11
Physics

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