$A$ beam of well-collimated cathode rays travelling with a speed of $5 \times 10^6 \, m/s$ enters a region of mutually perpendicular electric and magnetic fields and emerges undeviated from this region. If $|B| = 0.02 \, T$,the magnitude of the electric field is:
- A$10^5 \, V/m$
- B$2.5 \times 10^8 \, V/m$
- C$1.25 \times 10^{10} \, V/m$
- D$2 \times 10^3 \, V/m$
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