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3-1.Vectors
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જો $ |\,\vec A + \vec B\,|\, = \,|\,\vec A\,| + |\,\vec B\,| $ હોય, તો $ \vec A $ અને $ \vec B $ વચ્ચેનો ખૂણો ....... $^o$ હશે.
A
$90$
B
$120$
C
$0$
D
$60$
(AIPMT-2001)
Solution
(c) Resultant of two vectors $\overrightarrow A $ and $\overrightarrow B $ can be given by
$\overrightarrow R = \overrightarrow A + \overrightarrow B $
$|\overrightarrow R |\, = \,|\overrightarrow A + \overrightarrow B |\, = \sqrt {{A^2} + {B^2} + 2AB\cos \theta } $
If $\theta = 0^\circ $ then $|\overrightarrow R |\, = A + B$$ = \,|\overrightarrow A | + |\overrightarrow B |$
Standard 11
Physics
