$A$ narrow electron beam passes undeviated through an electric field $E = 3 \times 10^4 \ V/m$ and an overlapping magnetic field $B = 2 \times 10^{-3} \ Wb/m^2$. If the electric field and magnetic field are mutually perpendicular,the speed of the electrons is:
- A$60 \ m/s$
- B$10.3 \times 10^7 \ m/s$
- C$1.5 \times 10^7 \ m/s$
- D$0.67 \times 10^{-7} \ m/s$
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