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    4.

    What is the unit vector along i^+j^?\hat i + \hat j\,\,?

    A

    i^+j^2\frac{{\hat i + \hat j}}{{\sqrt 2 }}

    B

    2(i^+j^)\sqrt 2 \left( {\hat i + \hat j} \right)

    C

    i^+j^\hat i + \hat j

    D

    k^\hat k

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    5.

    Two vectors A\vec{A} and B\vec{B} have equal magnitudes. Under what condition will their difference have the same magnitude as either of the vectors?

    A

    The angle between the two vectors is 60 degrees.

    B

    The angle between the two vectors is 90 degrees.

    C

    The angle between the two vectors is 120 degrees.

    D

    The angle between the two vectors is 45 degrees.

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