Electric capacitance of spheric capacitor
$$C = \frac{4\cdot \pi\cdot \varepsilon\cdot \varepsilon0\cdot R1\cdot R2}{R2-R1}$$
C - electric capacitance
ε - dielectric constant (permittivity)
ε0 - permittivity constant
R1 - radius of the inner sphere
R2 - radius of outer sphere
ε - dielectric constant (permittivity)
ε0 - permittivity constant
R1 - radius of the inner sphere
R2 - radius of outer sphere
Find
It is known that:
= 