3-1.Vectors
medium

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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