A charged particle of mass ${\text{10}}^{\text{-3}}\text{kg}$ and charge ${\text{10}}^{\text{-5}}\text{C}$ enters a magnetic field of induction 1 T such that its direction of motion is perpendicular to the direction of magnetic field. If ${\text{g=10ms}}^{-2}$ , for what value of velocity will it pass straight through the field without deflection?