To rank, consider the time constant to be RC
The time constant is a function of capacitance.
(a) Time constant = RC/2
The capacitors in each circuit (a) through (d) pictured to the right, discharge when the switch closes at t = 0 seconds. Rank in order from largest to smallest, the length of time it takes for the circuit to discharge (i.e., the time constant for each circuit). The individual capacitors all have the same capacitance, and the light bulbs are identical in all circuits.
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