A charge q moves in a region where electric field and magnetic field both exist, then force on it is
$q\left( {\overrightarrow v \times \overrightarrow B } \right)$
$q\overrightarrow E + q\left( {\overrightarrow v \times \overrightarrow B } \right)$
$q\overrightarrow E + \overrightarrow q \left( {\overrightarrow B \times \overrightarrow v } \right)$
$q\overrightarrow B + \overrightarrow q \left( {\overrightarrow E \times \overrightarrow v } \right)$
