"Early black-and-white television sets used an electron beam to draw a picture on the screen. The electrons in the beam were accelerated by a voltage of 3.0 kV; the beam was then steered to different points on the screen by coils of wire that produced a magnetic field of up to 0.55"

Speed of electrons, v =

Explanation:

Given that,

The electrons in the beam were accelerated by a voltage of 3.0 kV, V = 3000 volts

Magnetic field, B = 0.55 T

Let us assume to find the speed of the electrons in the beam. In this case, final kinetic energy is equal to the electric potential energy lost moving in potential V

v is the speed of electron

m and e are mass and charge on electron

So, the speed of the electron is . Hence, this is the required solution.