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The projection of a vector vec(r )=3hat(...

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

A

2

B

`sqrt(14)`

C

`sqrt(10)`

D

`sqrt(5)`

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Verified by Experts

The correct Answer is:
C
`vec(R )= 3hat(i)+hat(j)+2hat(k)`
`:.` Length in XY plane `= sqrt(R_(x)^(2)+R_(y)^(2))= sqrt(3^(2)+1^(2))= sqrt(10)`
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