quartz and glass are composed of same elements, what difference(s) allows quartz to scratch glass?
Ignoring fringe effects, the capacitance of a parallel-plate capacitor in SI units is area * dielectric permitivity / separation
Area of each plate (A) = 6.5^2 cm^2 = 42.25 cm^2 = 0.004225 m^2 Dielectric constant of quartz (e) = 4.2 Permittivity of free space (e0) = 8.85 x 10^-12 F/m Distance between plates (d) = 2.0 mm = 0.002 m Capacitance = (e)(e0)(A/d) = (4.2)(8.85 x 10^-12)(0.004225/0.002) = 7.8522 x 10^ -11 F = (7.8522 x 10^-11)(10^12) pF = 78.522 pF
