Question

The nucleus of a Helium atom has a charge equal to twice the proton's charge. Let FN denote the magnitude of the force the Helium nucleus exerts on one of the electrons in a Helium atom, and let Fe denote the magnitude of the force one electron in the Helium atom exerts on the Helium nucleus.
A. FN < Fe
B. FN = Fe
C. FN > Fe

Choose (A), (B), or (C) and defend your answer.

Answer 1

FN = Fe

Explanation:

Although the charge aren't the same, it should be equal to the magnitude of the forces. The coulomb force governs between both the nucleus and the electron, which is equal to the charge element.

The FN and Fe magnitudes somehow have to be equal, because the ordering does not apply in the multiplication.

There is a much more specific explanation, however, for such powers to be equivalent: they are the relationship pair of the third law of Newton, which has the same in scale and the direction opposite .