$A$ charged particle with a velocity $2 \times 10^{3} \ ms^{-1}$ passes undeflected through electric and magnetic fields in mutually perpendicular directions. The magnetic field is $1.5 \ T$. The magnitude of the electric field will be:

• A
  $1.5 \times 10^{3} \ NC^{-1}$
• B
  $2 \times 10^{3} \ NC^{-1}$
• C
  $3 \times 10^{3} \ NC^{-1}$
• D
  $1.33 \times 10^{3} \ NC^{-1}$