Find the magnitude of $3 i + 2 j - k$

4

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\sqrt{14}

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2

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14

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Solution

The correct option is A $\sqrt{14}$
Length of any vector $x i + y j + z k$ $= \sqrt{x^{2} + y^{2} + z^{2}}$
Given the vector $3 i + 2 j - k$
Its length $= \sqrt{3^{2} + 2^{2} + {(- 1)}^{2}}$
$= \sqrt{14}$

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