Q. In a television tube, electrons initially at rest are accelerated by a uniform electric field of magnitude 4 times 105 N/C during the first 5 cm of the tube's length; afterwards they move at essentially constant velocity another 45 cm before hitting the screen. (1) Find out the speed of the electrons when they hit the screen. (2) How long does it take them to travel the length of the tube?
Q. Two identical positive charges exert a repulsive force of 6.2 x10-9 N when separated by a distance of 3.6 x10-10 m. compute the charge of each.