Two satellites are in circular orbits around the earth. satellite a is at an altitude equal to the earth's radius, while satellite b is at an altitude equal to three times the earth's radius. what is the ratio of their periods, tb/ta?

A6.0-μf air-filled capacitor is connected across a 100-v voltage source. after the source fully charges the capacitor, the capacitor is immersed in transformer oil (of dielectric constant 4.5). how much additional charge flows from the voltage source, which remained connected during the process?