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Is it necessary to mention the direction of a vector having zero magnitude?

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Knowledge Check

  • If hat n is unit vector in the direction of the vector vec A then

    A
    `hatn = ( vec A)/( | vec A|) `
    B
    `hatn = vec A |vec A|`
    C
    `hat n =(|vec A | )/( vec A )`
    D
    `hatn = hatn xx vec A.`

  • The vector in the direction of the vector hati-2hatj+2hatk that has magnitude 9 is

    A
    `hati-2hatj+2hatk`
    B
    `(hati-2hatj+2hatk)/3`
    C
    `3(hati-2hatj+2hatk)`
    D
    `(hati-2hatk+2hatk)`

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