Two concentric spheres of radii r1 and r2

Let us assume that the charge on the sphere is Q and its radius is R. Capacitance of the charged sphere can be found by imagining a concentric sphere of infinite radius consisting of −Q charge. Potential difference between the spheres = `1/(4pi∈_0) Q/R` - 0 = `1/(4pi∈_0) Q/R`

I've just begun learning capacitance, and my lecture notes have a section on calculating capacitance for capacitors in vacuum of various shapes, e.g. two parallel plates and concentric spherical shells. Two conducting concentric , hollow sphere A and B have radii a and b respectively with A inside B . Their common potentials is V . A is now given some charge such that its potential becomes zero . Consider two concentric spheres, with a gap between them. The inner sphere has radius R1, and the outer spherical shell has radius R2. It can of course have some thickness, and should be transparent. The gap between the inner sphere (which can also be a spherical shell) and the outer sphere's inner surface, is thus R2-R1.

Two concentric spherical conducting shells of radii R1 and R2 have potentials V1 and V2. Find V(r) between the shells.10.5 Make a definition of concentric circles where all center points are on equal distances from the x and the y axes. 10.6 Make a definition of concentric spheres in three-dimensional space. 10.6 Use Directives. In the preceding sections we have seen how software components are constructed. A nonconducting shpere of radius r2 contains a concentric spherical cavity of radius r1. The material between r1 and r2carries a uniform charge density ρE (C/m3). Determine the electric pontential V, relative to V=0 at r=∞, as a function of the distance r fromthe center for (a) r > r2, (b) r1 < r < r2and (c) 0 < r < r1.

Consider two concentric spherical metal shells of radii r1 and r2 (r2 > r1). If the outer shell has a charge q and the inner one is grounded, the char