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

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