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3-1.Vectors
easy
दो सदिशों $\mathop A\limits^ \to $ तथा $\mathop B\limits^ \to $ के मध्य कोण $\theta $ हो तो इनके योग का मान होगा
A
$\sqrt {{A^2} + {B^2} + 2AB\cos \theta } $
B
$\sqrt {{A^2} - {B^2} + 2AB\cos \theta } $
C
$\sqrt {{A^2} + {B^2} - 2AB\sin \theta } $
D
$\sqrt {{A^2} + {B^2} + 2AB\sin \theta } $
Solution
As we know,
Resultant of two vectors $\vec{A}$ and $\vec{B}$ is
$R =\sqrt{ A ^2+ B ^2+2 AB \cos \theta}$
Standard 11
Physics
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