Q. An electron accelerated from rest through a voltage of 420 V enters a region of constant magnetic field. If the electron follows a circular path with a radius of 18 cm, what is the magnitude of the magnetic field?
Q. In a television, electrons shoot down the picture tube and strike fluorescent material on the screen, causing light to be emitted and producing the picture. Suppose that a certain set, the electrons are accelerated from rest 2.0 x 10^8 ms-1 in about 1.20 cm.