An electron of charge 1.6 x 10^-19 C and mass 9.1 x 10^-31 kg is accelerated between two metal plates with a velocity of 4x10⁷ ms^-1, the potential difference between the plates is

• A.4.55x10¹ V
• B.9.10x10¹ V
• C.4.55x10² V
• D.45.5x10² V