Problem 9: An electron beam is shot into a region where there is both an electric field pointing upward of magnitude E = 9.6 N/C, and a magnetic field, B, as shown in the figure. While moving through the region the electron beam stays in a straight line with speed v = 390 m/s. Randomized Variables E = 9.6 N/C v = 390 m/s Part (a) In which direction does the electric force act on the electrons? MultipleChoice : 1) Upward. 2) To the right. 3) To the left. 4) Downward. Part (b) In order to keep the electrons in a straight line, in which direction should the magnetic force act? MultipleChoice: 1) Out of the screen. 2) To the left. 3) To the right. 4) Downward. 5) Into the screen. 6) Upward. Part (c) What should the direction of the magnetic field be in order to produce the force in part (b)? MultipleChoice : 1) Out of the screen. 2) Into the screen. Part (d) Express the magnitude of the electric force using the electric field E and the elementary charge e. Expression : FE = Select from the variables below to write your expression. Note that all variables may not be required. a, B, 0, B, d, e, E, g, h, i, j, m, P, t, v Part (e) Calculate the numerical value of the magnitude of FE, in newtons. Numeric : A numeric value is expected and not an expression. FE = Part (f) Express the magnitude of the magnetic force in terms of the elementary charge e, speed v, and B, the magnitude c the magnetic field. Expression : FB =

“ Problem 9: An electron beam is shot into a region where there is both an electric field pointing upward of magnitude E = 9.6 N/C, and a magnetic field, B, as shown in the figure. While moving through the region the electron beam stays in a straight line with speed v = 390 m/s. Randomized Variables E = 9.6 N/C v = 390 m/s Part (a) In which direction does the electric force act on the electrons? MultipleChoice : 1) Upward. 2) To the right. 3) To the left. 4) Downward. Part (b) In order to keep the electrons in a straight line, in which direction should the magnetic force act? MultipleChoice: 1) Out of the screen. 2) To the left. 3) To the right. 4) Downward. 5) Into the screen. 6) Upward. Part (c) What should the direction of the magnetic field be in order to produce the force in part (b)? MultipleChoice : 1) Out of the screen. 2) Into the screen. Part (d) Express the magnitude of the electric force using the electric field E and the elementary charge e. Expression : FE = Select from the variables below to write your expression. Note that all variables may not be required. a, B, 0, B, d, e, E, g, h, i, j, m, P, t, v Part (e) Calculate the numerical value of the magnitude of FE, in newtons. Numeric : A numeric value is expected and not an expression. FE = Part (f) Express the magnitude of the magnetic force in terms of the elementary charge e, speed v, and B, the magnitude c the magnetic field. Expression : FB = ”