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3-1.Vectors
easy

$\vec P = (k,\, 2,\, 3)$ અને $\vec Q = (0,\, 3,\,k )$ હોય અને $\overrightarrow P \, \bot \overrightarrow {Q\,} $ હોય, તો $k$ નું મૂલ્ય કેટલું ?

A$2$
B$-2$
C$4$
D$-6$

Solution

$\overrightarrow{ P } \perp \overrightarrow{ Q } \Rightarrow \overrightarrow{ P } \cdot \overrightarrow{ Q }=0$
$\therefore(k, 2,3) \cdot(0,3, k)=0$
$\therefore 0+6+3 k=0$
$\therefore 3 k=-6$
$\therefore k=-2$
Standard 11
Physics

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