A beam of electrons is accelerated through a potential difference of 10 kV before entering a region having uniform electric and magnetic fields that are perpendicular to each other and perpendicular to the direction in which the electron is moving. If the magnetic field in this region has a value of 0.010 T, what magnitude of the electric field is required if the particles are to be undeflected as they pass through the region? O 2.3 x 1013 V/m ( 7.2 x 1016 V /m O 5.9 x 1015 V/m ( 7.9 x 1013 V/mAn electron traveling toward the north with speed 4.0 x 10^5 m/s enters a region where the Earth's magnetic field has the magnitude 5.0 x 10^-5 T and is directed downward at 45 below horizontal. What is the magnitude of the force that the Earth's magnetic field exerts on the electron? (e = 1.60 x 10^-19 C) 3.2 x 10^-19 N 3.2 x 10^-18 N O 2.3 x 10^-19 N O 2.3 x 10^-18 NIn a mass spectrometer, a singly-charged particle (charge e) has a speed of 1.0 x 10^6 m/s and enters a uniform magnetic field of 0.20 T. The radius of the circular orbit of the particle is 0.020 m. What is the mass of this particle? (e = 1.60 x 10^-19 C) 3.2 x 10^-28 kg ( 4.5 x 101-27 kg ( 6.4 x 101-28 kg 1.7 x 10^-27 kg