Chapter 28, Problem 12P

Go At time t₁ an electron is sent along the positive direction of an x axis, through both an electric field and a magnetic field with directed parallel to the y axis. Figure 28-33 gives the y component F_net,_y of the net force on the electron due to the two fields, as a function of the electron’s speed v at time t₁. The scale of the velocity axis is set by v_s = 100.0 m/s. The .x and z components of the net force are zero at t₁. Assuming B_x = 0, find (a) the magnitude E and (b) in unit-vector notation.

Figure 28-33 Problem 12.