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Hindi
3-1.Vectors
normal

સદિશ $\overrightarrow A  , x, y$ અને $z$ સાથે સમાન ખૂણો બનાવે છે. તો તે સદિશના ઘટકનું મૂલ્ય મેળવો.

A

$\frac{A}{{\sqrt 3 }}$

B

$\frac{A}{{\sqrt 2 }}$

C

$\sqrt 3 \,A$

D

$\frac{{\sqrt 3 }}{A}$

Solution

$\alpha = \beta = \gamma $

${\cos ^2}\alpha + {\cos ^2}\beta + {\cos ^2}\gamma = 1$ $ \Rightarrow $ $3{\cos ^2}\alpha = 1$ $⇒$ $\cos \alpha = \frac{1}{{\sqrt 3 }}$

$\therefore \,{A_x} = {A_y} = {A_z} = A\cos \alpha = \frac{A}{{\sqrt 3 }}$

Standard 11
Physics

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