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charged particle with charge $q$ enters a region of constant, uniform and mutually orthogonal fields $\vec E$ and $\vec B$ with a velocity $\vec v$ perpendicular to both $\vec E$ and $\vec B$ , and comes out without any change in magnitude or direction of $\vec v$ . Then
  • A$\overrightarrow {\;v} $=$\;\frac{{\left( {\vec BX\vec E} \right)}}{{{E^2}}}$
  • B$\overrightarrow {\;v} = \frac{{\left( {\vec EX\vec B} \right)}}{{{B^2}}}$
  • C$\overrightarrow {\;v} $=$\;\frac{{\left( {\vec BX\vec E} \right)}}{{{B^2}}}$
  • D$\;\overrightarrow {\;v} = \frac{{\left( {\vec EX\vec B} \right)}}{{{E^2}}}$
AIEEE 2007, Medium
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