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 A narrow electron beam passes undeviated through an electric field E = 3×104 volt/m and an overlapping magnetic field B=2×10-3 Weber/m2. If electric field and magnetic field are mutually perpendicular. The speed of the electrons is 
(a) 60 m/s                          (b) 10.3×107 m/s
(c) 1.5×107 m/s                (d) 0.67×10-7 m/s