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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