The accelerating voltage that is applied to an electron gun is 45 kV, and the horizontal distance from the gun to a viewing screen is 0.43 m. The charge on an electron is 1.60218 ×10^-19 C and its mass is 9.10939 × 10^-31 kg. What is the deflection caused by the vertical component of the Earth's magnetic field or strength 4 × 10^-5 T, assuming that any change in the horizontal component of the beam velocity is negligible. Answer in units of m.