question_answer

A narrow electron beam passes undeviated through an electric field \[E=3\times {{10}^{4}}volt/m\]and an overlapping magnetic field \[B=2\times {{10}^{-3}}Weber/{{m}^{2}}\]. If electric field and magnetic field are mutually perpendicular. The speed of the electrons is                                                       [MP PET 1995]

A)            60 m/s                                    

B)            \[10.3\times {{10}^{7}}m/s\]

C)            \[1.5\times {{10}^{7}}m/s\]  

D)            \[0.67\times {{10}^{-7}}m/s\]