A vector $\vec A $ is rotated by a small angle $\Delta \theta$ radian $( \Delta \theta << 1)$ to get a new vector $\vec B$ In that case $\left| {\vec B - \vec A} \right|$ is

  • [JEE MAIN 2015]
  • A

    $\left| {\vec A} \right|\,\Delta \theta $

  • B

    $\left| {\vec B} \right|\,\Delta \theta  - \left| {\vec A} \right|\,$

  • C

    $\left| {\vec A} \right|\,\left( {1 - \frac{{\Delta {\theta ^2}}}{2}} \right)$

  • D

    $0$

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  • [JEE MAIN 2021]