Question

The electrons in a particle beam each have a kinetic energy, K. Find the magnitude of the electric field that will stop these electrons in a distance d, expressing the answer symbolically in terms of K, e, and d. Should the electric field point in the direction of the motion of the electron, or should it point in the opposite direction?

Answer 1

The direction of the electric field is same as the direction of electric force, so the electric field should be along the motion of the electron. Thus, the magnitude of the electric field to stop the electron is Ked K e d and it will be along the motion of the electron.

Step-by-step explanation: