A vector \( \vec{A} \) is rotated through an angle \( \pi / 2 \), t...

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A vector \( \vec{A} \) is rotated through an angle \( \pi / 2 \), the magnitude of new vector is -
\( \mathrm{P} \)
W
(1) \( 2 \mathrm{~A} \)
(2) \( \mathrm{A} \)
(3) \( \mathrm{A} / 2 \)
(4) Zero
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