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3-1.Vectors
easy
The angle between vectors $(\vec{M} \times \vec{N})$ and $(\bar{N} \times \vec{M})$ is ................
A
$0$
B
$60$
C
$90$
D
$180$
Solution
(d)
$\vec{M} \times \vec{N} \neq \vec{N} \times \vec{M}$
$\vec{M} \times \vec{N}$ is from $\vec{M}$ to $\vec{N}$
$\vec{N} \times \vec{M}$ is from $\vec{N}$ to $\vec{M}$
This means the two vectors are in opposite direction.
$\text { So, } \vec{M} \times \vec{N} =\vec{N} \times \vec{M}$
$=180^{\circ}$
Standard 11
Physics
