3-1.Vectors
medium

यदि $|\,\mathop A\limits^ \to + \mathop B\limits^ \to \,|\, = \,|\mathop A\limits^ \to \,| + |\,\mathop B\limits^ \to \,|$, तब $\mathop A\limits^ \to $तथा $\mathop B\limits^ \to $ के बीच का कोण ....... $^o$ होगा

A

$90$

B

$120$

C

$0$

D

$60$

(AIPMT-2001)

Solution

(c) दो सदिशों $\overrightarrow A $ तथा $\overrightarrow B $ का परिणामी होता है

$\overrightarrow R = \mathop A\limits^ \to + \mathop B\limits^ \to $

$|\overrightarrow R |\, = \,|\overrightarrow A + \overrightarrow B |\, = \sqrt {{A^2} + {B^2} + 2AB\cos \theta } $

यदि $\theta = 0^\circ $ हो, तब $|\overrightarrow R |\, = A + B$$ = \,|\overrightarrow A | + |\overrightarrow B |$

Standard 11
Physics

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