Q16:In a long, straight, vertical lightning stroke, electrons move downward and positive ions move upward and constitute a current of magnitude kA. At a loca- tion m east of the middle of the stroke, a free elec- tron drifts through the air toward the west with a speed of m/s.
(a) Make a sketch showing the various vec- tors involved. Ignore the effect of the Earth’s magnetic field.
(b) Find the vector force the lightning stroke exerts on the electron.
(c) Find the radius of the elec- tron’s path.
(d) Is it a good approximation to model the electron as moving in a uniform field? Explain your answer.
(e) If it does not collide with any obstacles, how many revolutions will the electron complete during the -ms duration of the lightning stroke?
q =
m =
pi =
g =
u =