An election moving with a speed u along the positive x-axis at y = 0 enters a region of uniform magnetic field which exists to the right of y-axis. The electron exits from the region after some time with the speed v at coordinate y, then

• A

  $\mathrm{v}>\mathrm{u},\mathrm{y}<0$

• B

  $\mathrm{v}=\mathrm{u},\mathrm{y}>0$

• C

  $\mathrm{v}>\mathrm{u},\mathrm{y}>0$

• D

  $\mathrm{v}=\mathrm{u},\mathrm{y}<0$