i couldnt get the right answer please help me In Figure below, an electron accel

Question

i couldnt get the right answer please help me

In Figure below, an electron accelerated from rest throughpotential difference V1=1.12 kV enters the gapbetween two parallel plates having separation d = 21.9 mmand potential difference V2= 56.4 V. The lowerplate is at the lower potential. Neglect fringing and assume thatthe electron's velocity vector is perpendicular to the electricfield vector between the plates. In unit-vector notation, whatuniform magnetic field allows the electron to travel in a straightline in the gap?

Explanation / Answer

   in this problem we ignore the gravity as straightline motion will result from zero net force acting on the system sothatwe
   get
   F = q (E + v xB)
      = 0
   when v is perpendicular to B
   |v x B| = vB
   so we get
   B = E / v
      = E / (2 KE /me)
      = ......... T

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