An electron is accelerated from rest by an electric field. After the acceleration, the electron is injected into a uniform magnetic field of $1\mathrm{.}27{10}^{-3}T.$ The velocity of the electron and the magnetic field lines are perpendicular to one another. The electron remains in the magnetic field for $5\mathrm{.}00{10}^{-9}s.$ The angle between the initial electron velocity and the final electron velocity is

$1\mathrm{.}1$ rad

$5\mathrm{.}8{10}^{-2}$rad

$8\mathrm{.}68{10}^{-2}$rad

$6\mathrm{.}5{10}^{-2}$rad

$2\mathrm{.}3$ rad