Gujarati
3-1.Vectors
medium

$\overrightarrow A + \overrightarrow B $ का परिणामी ${\mathop R\limits^ \to _1}$ है। सदिश $\overrightarrow {B,} $ को पलटने (विपरीत दिशा) पर परिणामी ${\mathop R\limits^ \to _2}$ हो जाता है। $R_1^2 + R_2^2$ का मान क्या होगा

A

${A^2} + {B^2}$

B

${A^2} - {B^2}$

C

$2({A^2} + {B^2})$

D

$2({A^2} - {B^2})$

Solution

(c) ${\mathop R\limits^ \to _1} = \mathop A\limits^ \to + \mathop B\limits^ \to $, ${\mathop R\limits^ \to _2} = \mathop A\limits^ \to – \mathop B\limits^ \to $

$R_1^2 + R_2^2 = {\left( {\sqrt {{A^2} + {B^2}} } \right)^2} + {\left( {\sqrt {{A^2} + {B^2}} } \right)^2}$=$2\left( {{A^2} + {B^2}} \right)$

Standard 11
Physics

Similar Questions

Start a Free Trial Now

Confusing about what to choose? Our team will schedule a demo shortly.