A narrow electron beam passes undeviated through an electric field E = 3 `xx` 104 V/m and an overlapping magnetic field B = 2 `xx` 10-3 Wb/m2 . The electron motion, electric field and magnetic field are mutually perpendicular. The speed of the electron is
60 ms-1
10.3 `xx` 107 ms-1
1.5 `xx` 107 ms-1
0.67 `xx` 10-7 ms-1