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A resistor and a capacitor are connected in series to a voltage source. The time constant for
the circuit is 0.870 s.
(a) Two capacitors, identical to the first, are added in series. What is the time constant for this
new circuit?
(b) In the original circuit two capacitors, identical to the first, are connected in parallel with the
first capacitor. What is the time constant for this new circuit?

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