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A vector $a$ has components $a_{1}, a_{2}, a_{3}$ in the right handed system OXYZ. If the coordinate system is rotated about z-axis through an angle $π / 2,$ the component of $a$ in the new system are

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$(a_{2}, a_{1}, a_{3})$

$(- a_{2}, a_{1}, a_{3})$

$(a_{2}, - a_{1}, a_{3})$

$(- a_{2}, - a_{1}, a_{3})$

answer is A.

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$(- a 2, a 1, a 3)$

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