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3-1.Vectors
easy
જો $\overrightarrow A \times \overrightarrow B=\overrightarrow B \times \overrightarrow A$ , તો $ \overrightarrow A $ અને $ \overrightarrow B $ વચ્ચેનો ખૂણો કેટલો હશે?
A
$\pi / 2 $
B
$\pi / 3$
C
$\pi $
D
$\pi / 4$
(AIEEE-2004)
Solution
(c) We know that $\overrightarrow A \times \overrightarrow B = – (\overrightarrow B \times \overrightarrow A )$ because the angle between these two is always $90^°$.
But if the angle between $\overrightarrow A $ and $\overrightarrow B $ is $0^°$. Then $\overrightarrow A \times \overrightarrow B = \overrightarrow B \times \overrightarrow A = 0$.
Standard 11
Physics
