A) 2
B) \[\sqrt{14}\]
C) \[\sqrt{10}\]
D) \[\sqrt{5}\]
Correct Answer: C
Solution :
\[\vec{R}=3\hat{i}+\hat{j}+2\hat{k}\] \ Length in XY plane = \[\sqrt{R_{x}^{2}+R_{y}^{2}}=\sqrt{{{3}^{2}}+{{1}^{2}}}\]\[=\sqrt{10}\]
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