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The projection of a vector `vec(r )=3hat(i)+hat(j)+2hat(k)` on the `x-y` plane has magnitude

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The projection of a vector `vec(r )=3hat(i)+hat(j)+2hat(k)` on the `x-y` plane has magnitude
A. 3
B. 4
C. `sqrt(14)`
D. `sqrt(10)`
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Correct Answer - D
Consider only `x` and `y` components: `sqrt(3^(3)+1^(2))=sqrt(10)`
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