An uncharged, series RC circuit is connected across a battery. For which situation will the time for the capacitor to reach 90% of its final charge remain unchanged?
a. The RC time constant is doubled
b. The battery voltage is doubled.
c. A second resistor is added in series with the original resistor.
d. All of these situations result in the time for the capacitor to reach 90% of its final charge to change.
b
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