Four separate RC circuits use different combinations of resistors and capacitors as described below. Which circuit has the greatest time constant?
• Circuit P: a 2kΩ resistor in series with a 2μF capacitor
• Circuit Q: a 1kΩ resistor in series with a 5μF capacitor
• Circuit R: a 3kΩ resistor in series with a 1μF capacitor
• Circuit S: a 4kΩ resistor in series with a 0.50μF capacitor
a) Circuit S
b) Circuit R
c) Circuit Q
d) Circuit P