Find out the velocity of singly charged particles which will be undeflected by traveling in the +x direction via a velocity choosing apparatus with and electric field of strength 12000 V/m directed in the -y direction and a magnetic field of strength of 2.0T?
i) 6000 m/s
ii) 24000 m/s
iii) 0.17 mm/s
iv) Undeterminable