To form a hydrogen atom, a proton is fixed at a point and an electron is brought from an effectively infinite distance from the proton to a distance of m from it. Find the magnitude of work done moving the electron.
A negative hydrogen ion is a hydrogen atom containing two electrons. An electron and a negative hydrogen ion are accelerated through the same potential. Find the ratio of their speeds after acceleration, assuming the speeds are non-relativistic. Use a value of kg for the mass of the hydrogen ion.
An object with a charge µC is initially at rest at a distance of 2.0 m from a fixed charge µC. What is the kinetic energy of the object when it is at a distance of 1.0 m from ?