question_answer

If an electron is going in the direction of magnetic field \[\overrightarrow{B}\] with the velocity of \[\overrightarrow{v\,}\] then the force on electron is [RPMT 1999]

A)            Zero                                         

B)            \[e\,(\overrightarrow{v\,}\cdot \overrightarrow{B})\]

C)            \[e\,(\overrightarrow{v\,}\times \overrightarrow{B})\]    

D)            None of these