Two separate circuits each contain a single resistor–capacitor series combination connected to identical DC power supplies.
• Circuit A uses a 1.0 kΩ resistor with a 2.0 µF capacitor.
• Circuit B uses a 2.0 kΩ resistor with a 1.0 µF capacitor.
Which circuit reaches 63 % of its final charge first? State your choice and give one brief sentence in support of your answer.