What should be the radius (measured in meters) of a charged-sphere capacitor so it acts as if it is a cylindrical capacitor with length 16 m, inner diameter 2 m, and outer diameter 7 m, in terms of capacitance? Assume both capacitors use the same dielectric. Express your answers accurate to four decimal places, whenever applicable.

What should be the radius (measured in meters) of a charged-sphere capacitor so it acts as if it is a cylindrical capacitor with length 16 m, inner diameter 2 m, and outer diameter 7 m, in terms of capacitance? Assume both capacitors use the same dielectric. Express your answers accurate to four decimal places, whenever applicable.