b. The electron's magnetic moment is known to be μ=qℏ/2m, where ℏ is the reduced Planck constant. In this model, what is the minimum possible radius of the electron? Express your answer in terms of m and fundamental constants.
Given constants:
## Electroneering
An electron is a particle with charge −q, mass m, and magnetic moment μ. In this problem we will explore whether a classical model consistent with these properties can also explain the rest energy E0=mc2 of the electron.
Let us describe the electron as a thin spherical shell with uniformly distributed charge and radius R. Recall that the magnetic moment of a closed, planar loop of current is always equal to the product of the current and the area of the loop. For the electron, a magnetic moment can be created by making the sphere rotate around an axis passing through its center.
Context question:
a. If no point on the sphere's surface can travel faster than the speed of light (in the frame of the sphere's center of mass), what is the maximum magnetic moment that the sphere can have? You may use the integral:
∫0πsin3θdθ=34
Context answer:
μ=qcR/3