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3-1.Vectors
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જો $A =3 \hat{ i }+4 \hat{ j }$ અને $B =6 \hat{ i }+8 \hat{ j }$ છે. નીચેના પૈકી શું સાચું છે?
A$A \times B =0$
B$\frac{| A |}{| B |}=\frac{1}{2}$
C$(a)$ અને $(b)$
D$A \cdot| B |=48$
Solution
(c)
$| A |=\sqrt{9+16}=5$ and $| B |=\sqrt{36+64}=10$. $B =2 A$ or $B$ is parallel to A. Ratio of their coefficients are equal, so they are parallel or their cross product is zero.
$| A |=\sqrt{9+16}=5$ and $| B |=\sqrt{36+64}=10$. $B =2 A$ or $B$ is parallel to A. Ratio of their coefficients are equal, so they are parallel or their cross product is zero.
Standard 11
Physics
