If a charged particle goes unaccelerated in a region containing electric and magnetic fields

  • A

    $\vec E$ must be parallel to $\vec B$

  • B

    $\vec v$ must be perpendicular to $\vec E$

  • C

    $\vec v$ must be perpendicular to $\vec B$

  • D

    $E$ must be equal to $vB$

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