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A vector is represented by `3hati+hatj+2hatk`. Its length in `XY` plane is

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A vector is represented by `3hati+hatj+2hatk`. Its length in `XY` plane is
A. 2
B. `sqrt(14)`
C. `sqrt(10)`
D. `sqrt(5)`
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Correct Answer - C
(c ) In XY-plane vector ia `3hati+hatj`
` therefore`Lrngth in XY-plane`=sqrt(9+1)=sqrt(10)`
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