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3-1.Vectors
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જો $ |\overrightarrow A \times \overrightarrow B |\, = \,|\overrightarrow A \,.\,\overrightarrow B |, $ હોય તો $ \overrightarrow A $ અને $ \overrightarrow B $ વચ્ચે ખૂણો ........ $^o$ હશે.
A
$30$
B
$45$
C
$60$
D
$90$
(AIIMS-2000)
Solution
(b) $|\vec A \times \vec B|\, = \vec A.\vec B$
$⇒$ $AB\sin \theta = AB\cos \theta $
$⇒$ $\tan \theta = 1$
$\theta = 45^\circ $
Standard 11
Physics
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