Two hollowed metallic spheres centered at the same point form a spherical capacitor. The space between the two spheres is filled with air. R₁ - R₂ = 1.5 mm, where R₁ and R ₂ are radii of the outer and inner spheres, respectively. The capacitor has a capacitance of 0.500 nF. Find values of R₁ and R₂.

A BNC-to-BNC cable used to transmit signals to a cathode ray oscilloscope has a coaxial cable between the connectors. The central copper wire has a diameter of 0.94 mm, while the 0 V silver-plated copper double braid surrounding the central copper conductor has a diameter of 3.53 mm. A dielectric material separates the two conductors. A jacket is used to insulate the entire assembly. Calculate capacitance per meter (C/m) for the BNC cable.

Even though spherical capacitors are very practical, we can still predict their capacitance theoretically. Derive an expression for the capacitance of the assembly of two hollowed conducting balls of diameter d₁ (outer ball) and d₂ (inner ball) that form a spherical capacitor.