An RC circuit with resistance R0 and capacitance C0 has a time constant ?0 . Which of the following additions to the circuit would result in the time constant doubling?
a. a capacitor with capacitance 3C0 in series with the original C0
b. a capacitor with capacitance C0 in series with the original C0
c. a capacitor with capacitance 3C0 in parallel with the original C0
d. a capacitor with capacitance C0 in parallel with the original C0
d
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