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3-1.Vectors
easy
જો $ \vec A.\vec B = - |A||B|, $ તો બે સદિશો $ \overrightarrow A $ અને $ \overrightarrow B $ વચ્ચે ખૂણો કેટલો હશે?
A
$0^°$
B
$60^°$
C
$180^°$
D
$90^° $
Solution
(c) $\overrightarrow A .\overrightarrow B = AB\cos \theta $
In the problem $\overrightarrow A .\overrightarrow B = – AB$ i.e. $\cos \theta = – 1$
$\theta = 180^\circ $
i.e. $\overrightarrow A $ and $\overrightarrow B $ acts in the opposite direction.
Standard 11
Physics