3-1.Vectors
medium

જો $\vec{A}=(2 \hat{i}+3 \hat{j}-\hat{k})\; m$ અને $\vec{B}=(\hat{i}+2 \hat{j}+2 \hat{k}) \;m$ છે. સદિશ $\vec{A}$ નો સદિશ $\vec{B}$ ની દિશામાંના ધટકનું મૂલ્ય $.....m$ થશે.

A

$2$

B

$1$

C

$3$

D

$4$

(JEE MAIN-2022)

Solution

$\overrightarrow{ A }=(2 \hat{ i }+3 \hat{ j }-\hat{ k }) m \text { and } \overrightarrow{ B }=(\hat{ i }+2 \hat{ j }+2 \hat{ k }) m$

Component of $\overrightarrow{ A }$ along $\overrightarrow{ B }=\overrightarrow{ A } \cdot \hat{ B }$

$=\frac{\overrightarrow{ A } \overrightarrow{ B }}{|\overrightarrow{ B }|}$ $=\frac{2+6-2}{\sqrt{1^{2}+2^{2}+2^{2}}}$

$=\frac{6}{3}=2$

Standard 11
Physics

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