Solving the Laplace equation for a constant potential calculates this quantity. This quantity is calculated as four pi times the permittivity of free space times radius for a sphere, and the reciprocal of this quantity is elastance. This quantity is found by summing the inverse of each individual value when their associated devices are connected in series, while it is summed directly when the devices are in parallel. An early device associated with this quantity is the Leyden jar. This quantity is more commonly found by dividing charge by voltage for a namesake parallel-plate device. For 10 points, name this quantity 
Solving the Laplace equation for a constant potential calculates this quantity. This quantity is calculated as four pi times the permittivity of free space times radius for a sphere, and the reciprocal of this quantity is elastance. This quantity is found by summing the inverse of each individual value when their associated devices are connected in series, while it is summed directly when the devices are in parallel. An early device associated with this quantity is the Leyden jar. This quantity is more commonly found by dividing charge by voltage for a namesake parallel-plate device. For 10 points, name this quantity that measures the ability of a body to store electrical charge.
Solving the Laplace equation for a constant potential calculates this quantity.