An electron is accelerated from rest for a time of 10" second by a uniform electric field that exerts a force of 8.0 x 10-15 Newtons on the electron. The charge of an electron is - 1.602 x 10 C, and the mass of an electron is 9.109 x 10 kg . What is the magnitude of the electric field? O 8.0 x 10-24 N/C O 9.1 x 10-22 N/C 8.0 x 106 N/C O 2.0 x 10-5 N/C 5.0 x 104 N/C The speed of the electron after it has accelerated for the 10-9 seconds is most nearly O 10' m/s O 103 m/s O 105 m/s O 10 m/s O 109 m/s