An electron of mass m and charge -e is moving through Part A a uniform magnetic field B = (Bz,0,0) in vacuum. (Figure 1)At the origin, it has velocity i = (vz, Vy, 0), where vz > 0 and v, > 0. A screen is mounted First, suppose Bz =0. Find the y coordinate y of the point at which the electron strikes the screen. perpendicular to the x axis at a distance D from the origin. Express your answer in terms of D and the velocity components vz and vy. • View Available Hint(s) Throughout, you can assume that the effect of gravity is negligible. Submit Previous Answers X Incorrect; Try Again; 6 attempts remaining Figure < 1 of 1> Part B Now suppose B, > 0, and another electron is projected in the same manner. Which of the following is the most accurate qualitative description of the electron's motion once it enters the region of nonzero magnetic field? B The electron decelerates before coming to a halt and turning around while always moving along a straight line. The electron's motion will be unaffected. (It will continue moving in a straight line with the same constant velocity.) screen O The electron moves in a circle in the xy plane. The electron moves along a helical path about an axis parallel to the field lines with constant radius and constant velocity in the x direction.

An electron of mass m and charge -e is moving through Part A a uniform magnetic field B = (Bz,0,0) in vacuum. (Figure 1)At the origin, it has velocity i = (vz, Vy, 0), where vz > 0 and v, > 0. A screen is mounted First, suppose Bz =0. Find the y coordinate y of the point at which the electron strikes the screen. perpendicular to the x axis at a distance D from the origin. Express your answer in terms of D and the velocity components vz and vy. • View Available Hint(s) Throughout, you can assume that the effect of gravity is negligible. Submit Previous Answers X Incorrect; Try Again; 6 attempts remaining Figure < 1 of 1> Part B Now suppose B, > 0, and another electron is projected in the same manner. Which of the following is the most accurate qualitative description of the electron's motion once it enters the region of nonzero magnetic field? B The electron decelerates before coming to a halt and turning around while always moving along a straight line. The electron's motion will be unaffected. (It will continue moving in a straight line with the same constant velocity.) screen O The electron moves in a circle in the xy plane. The electron moves along a helical path about an axis parallel to the field lines with constant radius and constant velocity in the x direction.