A charged capacitor is connected to a resistor and a switch as in the figure below. The circuit has a time constant of 2.15 s. Soon after the switch is closed, the charge on the capacitor is 67.0% of its initial charge.   (a) Find the time interval required for the capacitor to reach this charge.  s (b) If R = 280 kΩ, what is the value of C? C =  ?F

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