Find the magnitude of uniform electric field `E` in N / C (direction shown in figure) if an electron entering with velocity 100 m / s and making `30^(circ)` with the `x` -direction comes out making `60^(circ)` with the `x` -direction, after a time numerically equal to `(m)/(e)` of electron.
'(##CEN_KSR_PHY_JEE_C18_E01_020_Q08##)'

Answer

100