1.

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. \[0.67\times {{10}^{-7}}m/s\]
Answer» D. \[0.67\times {{10}^{-7}}m/s\]


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